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GitHub - GoogleChrome/web-vitals: Essential metrics for a healthy site.
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1.132-3.368.397-.406.89-.717 1.474-.952 1.399-1.136 3.392-2.093 6.122-2.093 2.731 0 4.767.957 6.166 2.093.584.235 1.077.546 1.474.952.85.869 1.132 2.037 1.132 3.368 0 .368-.014.733-.052 1.086.23.462.477 1.088.644 1.517 1.258.364 2.233 1.721 2.605 2.656a.832.832 0 0 1 .053.22v2.869a.641.641 0 0 1-.078.256ZM12.172 11h-.344a4.323 4.323 0 0 1-.355.508C10.703 12.455 9.555 13 7.965 13c-1.725 0-2.989-.359-3.782-1.259a2.005 2.005 0 0 1-.085-.104L4 11.741v6.585c1.435.779 4.514 2.179 8 2.179 3.486 0 6.565-1.4 8-2.179v-6.585l-.098-.104s-.033.045-.085.104c-.793.9-2.057 1.259-3.782 1.259-1.59 0-2.738-.545-3.508-1.492a4.323 4.323 0 0 1-.355-.508h-.016.016Zm.641-2.935c.136 1.057.403 1.913.878 2.497.442.544 1.134.938 2.344.938 1.573 0 2.292-.337 2.657-.751.384-.435.558-1.15.558-2.361 0-1.14-.243-1.847-.705-2.319-.477-.488-1.319-.862-2.824-1.025-1.487-.161-2.192.138-2.533.529-.269.307-.437.808-.438 1.578v.021c0 .265.021.562.063.893Zm-1.626 0c.042-.331.063-.628.063-.894v-.02c-.001-.77-.169-1.271-.438-1.578-.341-.391-1.046-.69-2.533-.529-1.505.163-2.347.537-2.824 1.025-.462.472-.705 1.179-.705 2.319 0 1.211.175 1.926.558 2.361.365.414 1.084.751 2.657.751 1.21 0 1.902-.394 2.344-.938.475-.584.742-1.44.878-2.497Z"></path><path d="M14.5 14.25a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Zm-5 0a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Z"></path> </svg> <div> <div class="color-fg-default h4">GitHub Copilot</div> Write better code with AI </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"security","context":"product","tag":"link","label":"security_link_product_navbar"}" href="https://github.com/features/security"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon 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</svg> <div> <div class="color-fg-default h4">Codespaces</div> Instant dev environments </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"issues","context":"product","tag":"link","label":"issues_link_product_navbar"}" href="https://github.com/features/issues"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-issue-opened color-fg-subtle mr-3"> <path d="M12 1c6.075 0 11 4.925 11 11s-4.925 11-11 11S1 18.075 1 12 5.925 1 12 1ZM2.5 12a9.5 9.5 0 0 0 9.5 9.5 9.5 9.5 0 0 0 9.5-9.5A9.5 9.5 0 0 0 12 2.5 9.5 9.5 0 0 0 2.5 12Zm9.5 2a2 2 0 1 1-.001-3.999A2 2 0 0 1 12 14Z"></path> </svg> <div> <div class="color-fg-default h4">Issues</div> Plan and track work </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline 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data-view-component="true" class="octicon octicon-code-square color-fg-subtle mr-3"> <path d="M10.3 8.24a.75.75 0 0 1-.04 1.06L7.352 12l2.908 2.7a.75.75 0 1 1-1.02 1.1l-3.5-3.25a.75.75 0 0 1 0-1.1l3.5-3.25a.75.75 0 0 1 1.06.04Zm3.44 1.06a.75.75 0 1 1 1.02-1.1l3.5 3.25a.75.75 0 0 1 0 1.1l-3.5 3.25a.75.75 0 1 1-1.02-1.1l2.908-2.7-2.908-2.7Z"></path><path d="M2 3.75C2 2.784 2.784 2 3.75 2h16.5c.966 0 1.75.784 1.75 1.75v16.5A1.75 1.75 0 0 1 20.25 22H3.75A1.75 1.75 0 0 1 2 20.25Zm1.75-.25a.25.25 0 0 0-.25.25v16.5c0 .138.112.25.25.25h16.5a.25.25 0 0 0 .25-.25V3.75a.25.25 0 0 0-.25-.25Z"></path> </svg> <div> <div class="color-fg-default h4">Code Search</div> Find more, search less </div> </a></li> </ul> </div> </div> <div class="HeaderMenu-column px-lg-4"> <div class="border-bottom pb-3 pb-lg-0 border-lg-bottom-0 border-bottom-0"> <span class="d-block h4 color-fg-default my-1" id="product-explore-heading">Explore</span> <ul class="list-style-none f5" aria-labelledby="product-explore-heading"> 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class="octicon octicon-shield"> <path d="M7.467.133a1.748 1.748 0 0 1 1.066 0l5.25 1.68A1.75 1.75 0 0 1 15 3.48V7c0 1.566-.32 3.182-1.303 4.682-.983 1.498-2.585 2.813-5.032 3.855a1.697 1.697 0 0 1-1.33 0c-2.447-1.042-4.049-2.357-5.032-3.855C1.32 10.182 1 8.566 1 7V3.48a1.75 1.75 0 0 1 1.217-1.667Zm.61 1.429a.25.25 0 0 0-.153 0l-5.25 1.68a.25.25 0 0 0-.174.238V7c0 1.358.275 2.666 1.057 3.86.784 1.194 2.121 2.34 4.366 3.297a.196.196 0 0 0 .154 0c2.245-.956 3.582-2.104 4.366-3.298C13.225 9.666 13.5 8.36 13.5 7V3.48a.251.251 0 0 0-.174-.237l-5.25-1.68ZM8.75 4.75v3a.75.75 0 0 1-1.5 0v-3a.75.75 0 0 1 1.5 0ZM9 10.5a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path> </svg> </span> <span data-view-component="true" class="ActionListItem-label"> Security </span> </a> </li> <li hidden="hidden" data-menu-item="i6insights-tab" data-targets="action-list.items" role="none" data-view-component="true" class="ActionListItem"> <a tabindex="-1" id="item-f8851dc1-0b25-4ea5-899d-e59c39883e18" href="/GoogleChrome/web-vitals/pulse" role="menuitem" data-view-component="true" class="ActionListContent ActionListContent--visual16"> <span class="ActionListItem-visual ActionListItem-visual--leading"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-graph"> <path d="M1.5 1.75V13.5h13.75a.75.75 0 0 1 0 1.5H.75a.75.75 0 0 1-.75-.75V1.75a.75.75 0 0 1 1.5 0Zm14.28 2.53-5.25 5.25a.75.75 0 0 1-1.06 0L7 7.06 4.28 9.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.25-3.25a.75.75 0 0 1 1.06 0L10 7.94l4.72-4.72a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042Z"></path> </svg> </span> <span data-view-component="true" class="ActionListItem-label"> Insights </span> </a> </li> </ul> </div></action-list> </div> </div></anchored-position> </focus-group> </action-menu></div> </nav> </div> <turbo-frame id="repo-content-turbo-frame" target="_top" data-turbo-action="advance" class=""> <div id="repo-content-pjax-container" class="repository-content " > <h1 class='sr-only'>GoogleChrome/web-vitals</h1> <div class="clearfix container-xl px-md-4 px-lg-5 px-3"> <div> <div style="max-width: 100%" data-view-component="true" class="Layout Layout--flowRow-until-md react-repos-overview-margin Layout--sidebarPosition-end Layout--sidebarPosition-flowRow-end"> <div data-view-component="true" class="Layout-main"> <script crossorigin="anonymous" defer="defer" type="application/javascript" src="https://github.githubassets.com/assets/primer-react-765944243383.js"></script> <script crossorigin="anonymous" defer="defer" type="application/javascript" src="https://github.githubassets.com/assets/react-core-cd0a67881543.js"></script> <script crossorigin="anonymous" defer="defer" type="application/javascript" src="https://github.githubassets.com/assets/react-lib-7b7b5264f6c1.js"></script> <script crossorigin="anonymous" defer="defer" type="application/javascript" 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dir=\"auto\"\u003e\u003ccode\u003eweb-vitals\u003c/code\u003e\u003c/h1\u003e\u003ca id=\"user-content-web-vitals\" class=\"anchor\" aria-label=\"Permalink: web-vitals\" href=\"#web-vitals\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#overview\"\u003eOverview\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#installation\"\u003eInstall and load the library\u003c/a\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#import-web-vitals-from-npm\"\u003eFrom npm\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#load-web-vitals-from-a-cdn\"\u003eFrom a CDN\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#usage\"\u003eUsage\u003c/a\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#basic-usage\"\u003eBasic usage\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#report-the-value-on-every-change\"\u003eReport the value on every change\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#report-only-the-delta-of-changes\"\u003eReport only the delta of changes\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#send-the-results-to-an-analytics-endpoint\"\u003eSend the results to an analytics endpoint\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#send-the-results-to-google-analytics\"\u003eSend the results to Google Analytics\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#send-the-results-to-google-tag-manager\"\u003eSend the results to Google Tag Manager\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#send-attribution-data\"\u003eSend attribution data\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#batch-multiple-reports-together\"\u003eBatch multiple reports together\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#build-options\"\u003eBuild options\u003c/a\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#which-build-is-right-for-you\"\u003eWhich build is right for you?\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#api\"\u003eAPI\u003c/a\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#types\"\u003eTypes\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#functions\"\u003eFunctions\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#rating-thresholds\"\u003eRating Thresholds\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#attribution\"\u003eAttribution\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#browser-support\"\u003eBrowser Support\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#limitations\"\u003eLimitations\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#development\"\u003eDevelopment\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#integrations\"\u003eIntegrations\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#license\"\u003eLicense\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eOverview\u003c/h2\u003e\u003ca id=\"user-content-overview\" class=\"anchor\" aria-label=\"Permalink: Overview\" href=\"#overview\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003eweb-vitals\u003c/code\u003e library is a tiny (~2K, brotli'd), modular library for measuring all the \u003ca href=\"https://web.dev/articles/vitals\" rel=\"nofollow\"\u003eWeb Vitals\u003c/a\u003e metrics on real users, in a way that accurately matches how they're measured by Chrome and reported to other Google tools (e.g. \u003ca href=\"https://developers.google.com/web/tools/chrome-user-experience-report\" rel=\"nofollow\"\u003eChrome User Experience Report\u003c/a\u003e, \u003ca href=\"https://developers.google.com/speed/pagespeed/insights/\" rel=\"nofollow\"\u003ePage Speed Insights\u003c/a\u003e, \u003ca href=\"https://webmasters.googleblog.com/2019/11/search-console-speed-report.html\" rel=\"nofollow\"\u003eSearch Console's Speed Report\u003c/a\u003e).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe library supports all of the \u003ca href=\"https://web.dev/articles/vitals#core_web_vitals\" rel=\"nofollow\"\u003eCore Web Vitals\u003c/a\u003e as well as a number of other metrics that are useful in diagnosing \u003ca href=\"https://web.dev/articles/user-centric-performance-metrics\" rel=\"nofollow\"\u003ereal-user\u003c/a\u003e performance issues.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCore Web Vitals\u003c/h3\u003e\u003ca id=\"user-content-core-web-vitals\" class=\"anchor\" aria-label=\"Permalink: Core Web Vitals\" href=\"#core-web-vitals\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"https://web.dev/articles/cls\" rel=\"nofollow\"\u003eCumulative Layout Shift (CLS)\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://web.dev/articles/inp\" rel=\"nofollow\"\u003eInteraction to Next Paint (INP)\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://web.dev/articles/lcp\" rel=\"nofollow\"\u003eLargest Contentful Paint (LCP)\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eOther metrics\u003c/h3\u003e\u003ca id=\"user-content-other-metrics\" class=\"anchor\" aria-label=\"Permalink: Other metrics\" href=\"#other-metrics\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"https://web.dev/articles/fcp\" rel=\"nofollow\"\u003eFirst Contentful Paint (FCP)\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://web.dev/articles/ttfb\" rel=\"nofollow\"\u003eTime to First Byte (TTFB)\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://web.dev/articles/fid\" rel=\"nofollow\"\u003eFirst Input Delay (FID)\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-alert markdown-alert-caution\" dir=\"auto\"\u003e\u003cp class=\"markdown-alert-title\" dir=\"auto\"\u003e\u003csvg class=\"octicon octicon-stop mr-2\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"M4.47.22A.749.749 0 0 1 5 0h6c.199 0 .389.079.53.22l4.25 4.25c.141.14.22.331.22.53v6a.749.749 0 0 1-.22.53l-4.25 4.25A.749.749 0 0 1 11 16H5a.749.749 0 0 1-.53-.22L.22 11.53A.749.749 0 0 1 0 11V5c0-.199.079-.389.22-.53Zm.84 1.28L1.5 5.31v5.38l3.81 3.81h5.38l3.81-3.81V5.31L10.69 1.5ZM8 4a.75.75 0 0 1 .75.75v3.5a.75.75 0 0 1-1.5 0v-3.5A.75.75 0 0 1 8 4Zm0 8a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z\"\u003e\u003c/path\u003e\u003c/svg\u003eCaution\u003c/p\u003e\u003cp dir=\"auto\"\u003eFID is deprecated and will be removed in the next major release.\u003c/p\u003e\n\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca name=\"user-content-installation\"\u003e\u003c/a\u003e\n\u003ca name=\"user-content-load-the-library\"\u003e\u003c/a\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eInstall and load the library\u003c/h2\u003e\u003ca id=\"user-content-install-and-load-the-library\" class=\"anchor\" aria-label=\"Permalink: Install and load the library\" href=\"#install-and-load-the-library\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca name=\"user-content-import-web-vitals-from-npm\"\u003e\u003c/a\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003eweb-vitals\u003c/code\u003e library uses the \u003ccode\u003ebuffered\u003c/code\u003e flag for \u003ca href=\"https://developer.mozilla.org/docs/Web/API/PerformanceObserver/observe\" rel=\"nofollow\"\u003ePerformanceObserver\u003c/a\u003e, allowing it to access performance entries that occurred before the library was loaded.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis means you do not need to load this library early in order to get accurate performance data. In general, this library should be deferred until after other user-impacting code has loaded.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eFrom npm\u003c/h3\u003e\u003ca id=\"user-content-from-npm\" class=\"anchor\" aria-label=\"Permalink: From npm\" href=\"#from-npm\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eYou can install this library from npm by running:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"npm install web-vitals\"\u003e\u003cpre\u003enpm install web-vitals\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-alert markdown-alert-note\" dir=\"auto\"\u003e\u003cp class=\"markdown-alert-title\" dir=\"auto\"\u003e\u003csvg class=\"octicon octicon-info mr-2\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z\"\u003e\u003c/path\u003e\u003c/svg\u003eNote\u003c/p\u003e\u003cp dir=\"auto\"\u003eIf you're not using npm, you can still load \u003ccode\u003eweb-vitals\u003c/code\u003e via \u003ccode\u003e\u0026lt;script\u0026gt;\u003c/code\u003e tags from a CDN like \u003ca href=\"https://unpkg.com\" rel=\"nofollow\"\u003eunpkg.com\u003c/a\u003e. See the \u003ca href=\"#load-web-vitals-from-a-cdn\"\u003eload \u003ccode\u003eweb-vitals\u003c/code\u003e from a CDN\u003c/a\u003e usage example below for details.\u003c/p\u003e\n\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThere are a few different builds of the \u003ccode\u003eweb-vitals\u003c/code\u003e library, and how you load the library depends on which build you want to use.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFor details on the difference between the builds, see \u003ca href=\"#which-build-is-right-for-you\"\u003ewhich build is right for you\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003e1. The \"standard\" build\u003c/strong\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo load the \"standard\" build, import modules from the \u003ccode\u003eweb-vitals\u003c/code\u003e package in your application code (as you would with any npm package and node-based build tool):\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import {onLCP, onINP, onCLS} from 'web-vitals';\n\nonCLS(console.log);\nonINP(console.log);\nonLCP(console.log);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eonLCP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eonINP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eonCLS\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'web-vitals'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-en\"\u003eonCLS\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003eonINP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003eonLCP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-alert markdown-alert-note\" dir=\"auto\"\u003e\u003cp class=\"markdown-alert-title\" dir=\"auto\"\u003e\u003csvg class=\"octicon octicon-info mr-2\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z\"\u003e\u003c/path\u003e\u003c/svg\u003eNote\u003c/p\u003e\u003cp dir=\"auto\"\u003eIn version 2, these functions were named \u003ccode\u003egetXXX()\u003c/code\u003e rather than \u003ccode\u003eonXXX()\u003c/code\u003e. They've \u003ca href=\"https://github.com/GoogleChrome/web-vitals/pull/222\" data-hovercard-type=\"pull_request\" data-hovercard-url=\"/GoogleChrome/web-vitals/pull/222/hovercard\"\u003ebeen renamed\u003c/a\u003e in version 3 to reduce confusion (see \u003ca href=\"https://github.com/GoogleChrome/web-vitals/pull/217\" data-hovercard-type=\"issue\" data-hovercard-url=\"/GoogleChrome/web-vitals/issues/217/hovercard\"\u003e#217\u003c/a\u003e for details) and will continue to be available using the \u003ccode\u003egetXXX()\u003c/code\u003e until at least version 4. Users are encouraged to switch to the new names, though, for future compatibility.\u003c/p\u003e\n\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca name=\"user-content-attribution-build\"\u003e\u003c/a\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003e2. The \"attribution\" build\u003c/strong\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eMeasuring the Web Vitals scores for your real users is a great first step toward optimizing the user experience. But if your scores aren't \u003cem\u003egood\u003c/em\u003e, the next step is to understand why they're not good and work to improve them.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe \"attribution\" build helps you do that by including additional diagnostic information with each metric to help you identify the root cause of poor performance as well as prioritize the most important things to fix.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe \"attribution\" build is slightly larger than the \"standard\" build (by about 600 bytes, brotli'd), so while the code size is still small, it's only recommended if you're actually using these features.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo load the \"attribution\" build, change any \u003ccode\u003eimport\u003c/code\u003e statements that reference \u003ccode\u003eweb-vitals\u003c/code\u003e to \u003ccode\u003eweb-vitals/attribution\u003c/code\u003e:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-diff notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"- import {onLCP, onINP, onCLS} from 'web-vitals';\n+ import {onLCP, onINP, onCLS} from 'web-vitals/attribution';\"\u003e\u003cpre\u003e\u003cspan class=\"pl-md\"\u003e\u003cspan class=\"pl-md\"\u003e-\u003c/span\u003e import {onLCP, onINP, onCLS} from 'web-vitals';\u003c/span\u003e\n\u003cspan class=\"pl-mi1\"\u003e\u003cspan class=\"pl-mi1\"\u003e+\u003c/span\u003e import {onLCP, onINP, onCLS} from 'web-vitals/attribution';\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eUsage for each of the imported function is identical to the standard build, but when importing from the attribution build, the \u003ca href=\"#metric\"\u003emetric\u003c/a\u003e objects will contain an additional \u003ca href=\"#attribution\"\u003e\u003ccode\u003eattribution\u003c/code\u003e\u003c/a\u003e property.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSee \u003ca href=\"#send-attribution-data\"\u003eSend attribution data\u003c/a\u003e for usage examples, and the \u003ca href=\"#attribution\"\u003e\u003ccode\u003eattribution\u003c/code\u003e reference\u003c/a\u003e for details on what values are added for each metric.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ca name=\"user-content-load-web-vitals-from-a-cdn\"\u003e\u003c/a\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eFrom a CDN\u003c/h3\u003e\u003ca id=\"user-content-from-a-cdn\" class=\"anchor\" aria-label=\"Permalink: From a CDN\" href=\"#from-a-cdn\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe recommended way to use the \u003ccode\u003eweb-vitals\u003c/code\u003e package is to install it from npm and integrate it into your build process. However, if you're not using npm, it's still possible to use \u003ccode\u003eweb-vitals\u003c/code\u003e by requesting it from a CDN that serves npm package files.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe following examples show how to load \u003ccode\u003eweb-vitals\u003c/code\u003e from \u003ca href=\"https://unpkg.com/browse/web-vitals/\" rel=\"nofollow\"\u003eunpkg.com\u003c/a\u003e. It is also possible to load this from \u003ca href=\"https://www.jsdelivr.com/package/npm/web-vitals\" rel=\"nofollow\"\u003ejsDelivr\u003c/a\u003e, and \u003ca href=\"https://cdnjs.com/libraries/web-vitals\" rel=\"nofollow\"\u003ecdnjs\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cem\u003e\u003cstrong\u003eImportant!\u003c/strong\u003e The \u003ca href=\"https://unpkg.com\" rel=\"nofollow\"\u003eunpkg.com\u003c/a\u003e, \u003ca href=\"https://www.jsdelivr.com/\" rel=\"nofollow\"\u003ejsDelivr\u003c/a\u003e, and \u003ca href=\"https://cdnjs.com\" rel=\"nofollow\"\u003ecdnjs\u003c/a\u003e CDNs are shown here for example purposes only. \u003ccode\u003eunpkg.com\u003c/code\u003e, \u003ccode\u003ejsDelivr\u003c/code\u003e, and \u003ccode\u003ecdnjs\u003c/code\u003e are not affiliated with Google, and there are no guarantees that loading the library from those CDNs will continue to work in the future. Self-hosting the built files rather than loading from the CDN is better for security, reliability, and performance reasons.\u003c/em\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eLoad the \"standard\" build\u003c/strong\u003e \u003cem\u003e(using a module script)\u003c/em\u003e\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-basic notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"\u0026lt;!-- Append the `?module` param to load the module version of `web-vitals` --\u0026gt;\n\u0026lt;script type=\u0026quot;module\u0026quot;\u0026gt;\n import {onCLS, onINP, onLCP} from 'https://unpkg.com/web-vitals@4?module';\n\n onCLS(console.log);\n onINP(console.log);\n onLCP(console.log);\n\u0026lt;/script\u0026gt;\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e\u0026lt;!-- Append the `?module` param to load the module version of `web-vitals` --\u0026gt;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etype\u003c/span\u003e=\"\u003cspan class=\"pl-s\"\u003emodule\u003c/span\u003e\"\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eonCLS\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eonINP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eonLCP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'https://unpkg.com/web-vitals@4?module'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n \u003cspan class=\"pl-en\"\u003eonCLS\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003eonINP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003eonLCP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e\u0026lt;/\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eLoad the \"standard\" build\u003c/strong\u003e \u003cem\u003e(using a classic script)\u003c/em\u003e\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-basic notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"\u0026lt;script\u0026gt;\n (function () {\n var script = document.createElement('script');\n script.src = 'https://unpkg.com/web-vitals@4/dist/web-vitals.iife.js';\n script.onload = function () {\n // When loading `web-vitals` using a classic script, all the public\n // methods can be found on the `webVitals` global namespace.\n webVitals.onCLS(console.log);\n webVitals.onINP(console.log);\n webVitals.onLCP(console.log);\n };\n document.head.appendChild(script);\n })();\n\u0026lt;/script\u0026gt;\"\u003e\u003cpre\u003e\u003cspan class=\"pl-kos\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003evar\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003escript\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003edocument\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ecreateElement\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'script'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003escript\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003esrc\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'https://unpkg.com/web-vitals@4/dist/web-vitals.iife.js'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003escript\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eonload\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// When loading `web-vitals` using a classic script, all the public\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// methods can be found on the `webVitals` global namespace.\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003ewebVitals\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eonCLS\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003ewebVitals\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eonINP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003ewebVitals\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eonLCP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-smi\"\u003edocument\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ehead\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eappendChild\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003escript\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e\u0026lt;/\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eLoad the \"attribution\" build\u003c/strong\u003e \u003cem\u003e(using a module script)\u003c/em\u003e\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-basic notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"\u0026lt;!-- Append the `?module` param to load the module version of `web-vitals` --\u0026gt;\n\u0026lt;script type=\u0026quot;module\u0026quot;\u0026gt;\n import {\n onCLS,\n onINP,\n onLCP,\n } from 'https://unpkg.com/web-vitals@4/dist/web-vitals.attribution.js?module';\n\n onCLS(console.log);\n onINP(console.log);\n onLCP(console.log);\n\u0026lt;/script\u0026gt;\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e\u0026lt;!-- Append the `?module` param to load the module version of `web-vitals` --\u0026gt;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003etype\u003c/span\u003e=\"\u003cspan class=\"pl-s\"\u003emodule\u003c/span\u003e\"\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003eonCLS\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003eonINP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003eonLCP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'https://unpkg.com/web-vitals@4/dist/web-vitals.attribution.js?module'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n \u003cspan class=\"pl-en\"\u003eonCLS\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003eonINP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003eonLCP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e\u0026lt;/\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eLoad the \"attribution\" build\u003c/strong\u003e \u003cem\u003e(using a classic script)\u003c/em\u003e\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-basic notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"\u0026lt;script\u0026gt;\n (function () {\n var script = document.createElement('script');\n script.src =\n 'https://unpkg.com/web-vitals@4/dist/web-vitals.attribution.iife.js';\n script.onload = function () {\n // When loading `web-vitals` using a classic script, all the public\n // methods can be found on the `webVitals` global namespace.\n webVitals.onCLS(console.log);\n webVitals.onINP(console.log);\n webVitals.onLCP(console.log);\n };\n document.head.appendChild(script);\n })();\n\u0026lt;/script\u0026gt;\"\u003e\u003cpre\u003e\u003cspan class=\"pl-kos\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003evar\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003escript\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003edocument\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003ecreateElement\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'script'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003escript\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003esrc\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e'https://unpkg.com/web-vitals@4/dist/web-vitals.attribution.iife.js'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003escript\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eonload\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// When loading `web-vitals` using a classic script, all the public\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// methods can be found on the `webVitals` global namespace.\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003ewebVitals\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eonCLS\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003ewebVitals\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eonINP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003ewebVitals\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eonLCP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-smi\"\u003edocument\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ehead\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eappendChild\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003escript\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e\u0026lt;/\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eUsage\u003c/h2\u003e\u003ca id=\"user-content-usage\" class=\"anchor\" aria-label=\"Permalink: Usage\" href=\"#usage\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBasic usage\u003c/h3\u003e\u003ca id=\"user-content-basic-usage\" class=\"anchor\" aria-label=\"Permalink: Basic usage\" href=\"#basic-usage\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eEach of the Web Vitals metrics is exposed as a single function that takes a \u003ccode\u003ecallback\u003c/code\u003e function that will be called any time the metric value is available and ready to be reported.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe following example measures each of the Core Web Vitals metrics and logs the result to the console once its value is ready to report.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cem\u003e(The examples below import the \"standard\" build, but they will work with the \"attribution\" build as well.)\u003c/em\u003e\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import {onCLS, onINP, onLCP} from 'web-vitals';\n\nonCLS(console.log);\nonINP(console.log);\nonLCP(console.log);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eonCLS\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eonINP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eonLCP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'web-vitals'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-en\"\u003eonCLS\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003eonINP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003eonLCP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNote that some of these metrics will not report until the user has interacted with the page, switched tabs, or the page starts to unload. If you don't see the values logged to the console immediately, try reloading the page (with \u003ca href=\"https://developer.chrome.com/docs/devtools/console/reference/#persist\" rel=\"nofollow\"\u003epreserve log\u003c/a\u003e enabled) or switching tabs and then switching back.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAlso, in some cases a metric callback may never be called:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eFID and INP are not reported if the user never interacts with the page.\u003c/li\u003e\n\u003cli\u003eCLS, FCP, FID, and LCP are not reported if the page was loaded in the background.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eIn other cases, a metric callback may be called more than once:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eCLS and INP should be reported any time the \u003ca href=\"https://developer.chrome.com/blog/page-lifecycle-api/#advice-hidden\" rel=\"nofollow\"\u003epage's \u003ccode\u003evisibilityState\u003c/code\u003e changes to hidden\u003c/a\u003e.\u003c/li\u003e\n\u003cli\u003eAll metrics are reported again (with the above exceptions) after a page is restored from the \u003ca href=\"https://web.dev/articles/bfcache\" rel=\"nofollow\"\u003eback/forward cache\u003c/a\u003e.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-alert markdown-alert-warning\" dir=\"auto\"\u003e\u003cp class=\"markdown-alert-title\" dir=\"auto\"\u003e\u003csvg class=\"octicon octicon-alert mr-2\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"M6.457 1.047c.659-1.234 2.427-1.234 3.086 0l6.082 11.378A1.75 1.75 0 0 1 14.082 15H1.918a1.75 1.75 0 0 1-1.543-2.575Zm1.763.707a.25.25 0 0 0-.44 0L1.698 13.132a.25.25 0 0 0 .22.368h12.164a.25.25 0 0 0 .22-.368Zm.53 3.996v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 11a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z\"\u003e\u003c/path\u003e\u003c/svg\u003eWarning\u003c/p\u003e\u003cp dir=\"auto\"\u003eDo not call any of the Web Vitals functions (e.g. \u003ccode\u003eonCLS()\u003c/code\u003e, \u003ccode\u003eonINP()\u003c/code\u003e, \u003ccode\u003eonLCP()\u003c/code\u003e) more than once per page load. Each of these functions creates a \u003ccode\u003ePerformanceObserver\u003c/code\u003e instance and registers event listeners for the lifetime of the page. While the overhead of calling these functions once is negligible, calling them repeatedly on the same page may eventually result in a memory leak.\u003c/p\u003e\n\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eReport the value on every change\u003c/h3\u003e\u003ca id=\"user-content-report-the-value-on-every-change\" class=\"anchor\" aria-label=\"Permalink: Report the value on every change\" href=\"#report-the-value-on-every-change\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIn most cases, you only want the \u003ccode\u003ecallback\u003c/code\u003e function to be called when the metric is ready to be reported. However, it is possible to report every change (e.g. each larger layout shift as it happens) by setting \u003ccode\u003ereportAllChanges\u003c/code\u003e to \u003ccode\u003etrue\u003c/code\u003e in the optional, \u003ca href=\"#reportopts\"\u003econfiguration object\u003c/a\u003e (second parameter).\u003c/p\u003e\n\u003cdiv class=\"markdown-alert markdown-alert-important\" dir=\"auto\"\u003e\u003cp class=\"markdown-alert-title\" dir=\"auto\"\u003e\u003csvg class=\"octicon octicon-report mr-2\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"M0 1.75C0 .784.784 0 1.75 0h12.5C15.216 0 16 .784 16 1.75v9.5A1.75 1.75 0 0 1 14.25 13H8.06l-2.573 2.573A1.458 1.458 0 0 1 3 14.543V13H1.75A1.75 1.75 0 0 1 0 11.25Zm1.75-.25a.25.25 0 0 0-.25.25v9.5c0 .138.112.25.25.25h2a.75.75 0 0 1 .75.75v2.19l2.72-2.72a.749.749 0 0 1 .53-.22h6.5a.25.25 0 0 0 .25-.25v-9.5a.25.25 0 0 0-.25-.25Zm7 2.25v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 9a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z\"\u003e\u003c/path\u003e\u003c/svg\u003eImportant\u003c/p\u003e\u003cp dir=\"auto\"\u003e\u003ccode\u003ereportAllChanges\u003c/code\u003e only reports when the \u003cstrong\u003emetric changes\u003c/strong\u003e, not for each \u003cstrong\u003einput to the metric\u003c/strong\u003e. For example, a new layout shift that does not increase the CLS metric will not be reported even with \u003ccode\u003ereportAllChanges\u003c/code\u003e set to \u003ccode\u003etrue\u003c/code\u003e because the CLS metric has not changed. Similarly, for INP, each interaction is not reported even with \u003ccode\u003ereportAllChanges\u003c/code\u003e set to \u003ccode\u003etrue\u003c/code\u003e—just when an interaction causes an increase to INP.\u003c/p\u003e\n\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis can be useful when debugging, but in general using \u003ccode\u003ereportAllChanges\u003c/code\u003e is not needed (or recommended) for measuring these metrics in production.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import {onCLS} from 'web-vitals';\n\n// Logs CLS as the value changes.\nonCLS(console.log, {reportAllChanges: true});\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eonCLS\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'web-vitals'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// Logs CLS as the value changes.\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003eonCLS\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003ereportAllChanges\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eReport only the delta of changes\u003c/h3\u003e\u003ca id=\"user-content-report-only-the-delta-of-changes\" class=\"anchor\" aria-label=\"Permalink: Report only the delta of changes\" href=\"#report-only-the-delta-of-changes\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSome analytics providers allow you to update the value of a metric, even after you've already sent it to their servers (overwriting the previously-sent value with the same \u003ccode\u003eid\u003c/code\u003e).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eOther analytics providers, however, do not allow this, so instead of reporting the new value, you need to report only the delta (the difference between the current value and the last-reported value). You can then compute the total value by summing all metric deltas sent with the same ID.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe following example shows how to use the \u003ccode\u003eid\u003c/code\u003e and \u003ccode\u003edelta\u003c/code\u003e properties:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import {onCLS, onINP, onLCP} from 'web-vitals';\n\nfunction logDelta({name, id, delta}) {\n console.log(`${name} matching ID ${id} changed by ${delta}`);\n}\n\nonCLS(logDelta);\nonINP(logDelta);\nonLCP(logDelta);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eonCLS\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eonINP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eonLCP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'web-vitals'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e \u003cspan class=\"pl-en\"\u003elogDelta\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003ename\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e id\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e delta\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e`\u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-kos\"\u003e${\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ename\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/span\u003e matching ID \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-kos\"\u003e${\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eid\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/span\u003e changed by \u003cspan class=\"pl-s1\"\u003e\u003cspan class=\"pl-kos\"\u003e${\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003edelta\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/span\u003e`\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n\u003cspan class=\"pl-en\"\u003eonCLS\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003elogDelta\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003eonINP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003elogDelta\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003eonLCP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003elogDelta\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-alert markdown-alert-note\" dir=\"auto\"\u003e\u003cp class=\"markdown-alert-title\" dir=\"auto\"\u003e\u003csvg class=\"octicon octicon-info mr-2\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z\"\u003e\u003c/path\u003e\u003c/svg\u003eNote\u003c/p\u003e\u003cp dir=\"auto\"\u003eThe first time the \u003ccode\u003ecallback\u003c/code\u003e function is called, its \u003ccode\u003evalue\u003c/code\u003e and \u003ccode\u003edelta\u003c/code\u003e properties will be the same.\u003c/p\u003e\n\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIn addition to using the \u003ccode\u003eid\u003c/code\u003e field to group multiple deltas for the same metric, it can also be used to differentiate different metrics reported on the same page. For example, after a back/forward cache restore, a new metric object is created with a new \u003ccode\u003eid\u003c/code\u003e (since back/forward cache restores are considered separate page visits).\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSend the results to an analytics endpoint\u003c/h3\u003e\u003ca id=\"user-content-send-the-results-to-an-analytics-endpoint\" class=\"anchor\" aria-label=\"Permalink: Send the results to an analytics endpoint\" href=\"#send-the-results-to-an-analytics-endpoint\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe following example measures each of the Core Web Vitals metrics and reports them to a hypothetical \u003ccode\u003e/analytics\u003c/code\u003e endpoint, as soon as each is ready to be sent.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003esendToAnalytics()\u003c/code\u003e function uses the \u003ca href=\"https://developer.mozilla.org/docs/Web/API/Navigator/sendBeacon\" rel=\"nofollow\"\u003e\u003ccode\u003enavigator.sendBeacon()\u003c/code\u003e\u003c/a\u003e method (if available), but falls back to the \u003ca href=\"https://developer.mozilla.org/docs/Web/API/Fetch_API\" rel=\"nofollow\"\u003e\u003ccode\u003efetch()\u003c/code\u003e\u003c/a\u003e API when not.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import {onCLS, onINP, onLCP} from 'web-vitals';\n\nfunction sendToAnalytics(metric) {\n // Replace with whatever serialization method you prefer.\n // Note: JSON.stringify will likely include more data than you need.\n const body = JSON.stringify(metric);\n\n // Use `navigator.sendBeacon()` if available, falling back to `fetch()`.\n (navigator.sendBeacon \u0026amp;\u0026amp; navigator.sendBeacon('/analytics', body)) ||\n fetch('/analytics', {body, method: 'POST', keepalive: true});\n}\n\nonCLS(sendToAnalytics);\nonINP(sendToAnalytics);\nonLCP(sendToAnalytics);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eonCLS\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eonINP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eonLCP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'web-vitals'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e \u003cspan class=\"pl-en\"\u003esendToAnalytics\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003emetric\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Replace with whatever serialization method you prefer.\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Note: JSON.stringify will likely include more data than you need.\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ebody\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eJSON\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003estringify\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003emetric\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e// Use `navigator.sendBeacon()` if available, falling back to `fetch()`.\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003enavigator\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003esendBeacon\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u0026amp;\u0026amp;\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003enavigator\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003esendBeacon\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'/analytics'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ebody\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e||\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003efetch\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'/analytics'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003ebody\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003emethod\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e'POST'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ekeepalive\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n\u003cspan class=\"pl-en\"\u003eonCLS\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003esendToAnalytics\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003eonINP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003esendToAnalytics\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003eonLCP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003esendToAnalytics\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSend the results to Google Analytics\u003c/h3\u003e\u003ca id=\"user-content-send-the-results-to-google-analytics\" class=\"anchor\" aria-label=\"Permalink: Send the results to Google Analytics\" href=\"#send-the-results-to-google-analytics\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eGoogle Analytics does not support reporting metric distributions in any of its built-in reports; however, if you set a unique event parameter value (in this case, the metric_id, as shown in the example below) on every metric instance that you send to Google Analytics, you can create a report yourself by first getting the data via the \u003ca href=\"https://developers.google.com/analytics/devguides/reporting/data/v1\" rel=\"nofollow\"\u003eGoogle Analytics Data API\u003c/a\u003e or via \u003ca href=\"https://support.google.com/analytics/answer/9358801\" rel=\"nofollow\"\u003eBigQuery export\u003c/a\u003e and then visualizing it any charting library you choose.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"https://support.google.com/analytics/answer/10089681\" rel=\"nofollow\"\u003eGoogle Analytics 4\u003c/a\u003e introduces a new Event model allowing custom parameters instead of a fixed category, action, and label. It also supports non-integer values, making it easier to measure Web Vitals metrics compared to previous versions.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import {onCLS, onINP, onLCP} from 'web-vitals';\n\nfunction sendToGoogleAnalytics({name, delta, value, id}) {\n // Assumes the global `gtag()` function exists, see:\n // https://developers.google.com/analytics/devguides/collection/ga4\n gtag('event', name, {\n // Built-in params:\n value: delta, // Use `delta` so the value can be summed.\n // Custom params:\n metric_id: id, // Needed to aggregate events.\n metric_value: value, // Optional.\n metric_delta: delta, // Optional.\n\n // OPTIONAL: any additional params or debug info here.\n // See: https://web.dev/articles/debug-performance-in-the-field\n // metric_rating: 'good' | 'needs-improvement' | 'poor',\n // debug_info: '...',\n // ...\n });\n}\n\nonCLS(sendToGoogleAnalytics);\nonINP(sendToGoogleAnalytics);\nonLCP(sendToGoogleAnalytics);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eonCLS\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eonINP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eonLCP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'web-vitals'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e \u003cspan class=\"pl-en\"\u003esendToGoogleAnalytics\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003ename\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e delta\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e value\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e id\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Assumes the global `gtag()` function exists, see:\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// https://developers.google.com/analytics/devguides/collection/ga4\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003egtag\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'event'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ename\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Built-in params:\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003evalue\u003c/span\u003e: \u003cspan class=\"pl-s1\"\u003edelta\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// Use `delta` so the value can be summed.\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Custom params:\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003emetric_id\u003c/span\u003e: \u003cspan class=\"pl-s1\"\u003eid\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// Needed to aggregate events.\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003emetric_value\u003c/span\u003e: \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// Optional.\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003emetric_delta\u003c/span\u003e: \u003cspan class=\"pl-s1\"\u003edelta\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// Optional.\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e// OPTIONAL: any additional params or debug info here.\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// See: https://web.dev/articles/debug-performance-in-the-field\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// metric_rating: 'good' | 'needs-improvement' | 'poor',\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// debug_info: '...',\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// ...\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n\u003cspan class=\"pl-en\"\u003eonCLS\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003esendToGoogleAnalytics\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003eonINP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003esendToGoogleAnalytics\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003eonLCP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003esendToGoogleAnalytics\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFor details on how to query this data in \u003ca href=\"https://cloud.google.com/bigquery\" rel=\"nofollow\"\u003eBigQuery\u003c/a\u003e, or visualise it in \u003ca href=\"https://lookerstudio.google.com/\" rel=\"nofollow\"\u003eLooker Studio\u003c/a\u003e, see \u003ca href=\"https://web.dev/articles/vitals-ga4\" rel=\"nofollow\"\u003eMeasure and debug performance with Google Analytics 4 and BigQuery\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSend the results to Google Tag Manager\u003c/h3\u003e\u003ca id=\"user-content-send-the-results-to-google-tag-manager\" class=\"anchor\" aria-label=\"Permalink: Send the results to Google Tag Manager\" href=\"#send-the-results-to-google-tag-manager\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhile \u003ccode\u003eweb-vitals\u003c/code\u003e can be called directly from Google Tag Manager, using a pre-defined custom template makes this considerably easier. Some recommended templates include:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"https://tagmanager.google.com/gallery/#/owners/gtm-templates-simo-ahava/templates/core-web-vitals\" rel=\"nofollow\"\u003eCore Web Vitals\u003c/a\u003e by \u003ca href=\"https://www.simoahava.com/\" rel=\"nofollow\"\u003eSimo Ahava\u003c/a\u003e. See \u003ca href=\"https://www.simoahava.com/analytics/track-core-web-vitals-in-ga4-with-google-tag-manager/\" rel=\"nofollow\"\u003eTrack Core Web Vitals in GA4 with Google Tag Manager\u003c/a\u003e for usage and installation instructions.\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/google-marketing-solutions/web-vitals-gtm-template\"\u003eWeb Vitals Template for Google Tag Manager\u003c/a\u003e by The Google Marketing Solutions team. See the \u003ca href=\"https://github.com/google-marketing-solutions/web-vitals-gtm-template?tab=readme-ov-file#web-vitals-template-for-google-tag-manager\"\u003eREADME\u003c/a\u003e for usage and installation instructions.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSend attribution data\u003c/h3\u003e\u003ca id=\"user-content-send-attribution-data\" class=\"anchor\" aria-label=\"Permalink: Send attribution data\" href=\"#send-attribution-data\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhen using the \u003ca href=\"#attribution-build\"\u003eattribution build\u003c/a\u003e, you can send additional data to help you debug \u003cem\u003ewhy\u003c/em\u003e the metric values are they way they are.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis example sends an additional \u003ccode\u003edebug_target\u003c/code\u003e param to Google Analytics, corresponding to the element most associated with each metric.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import {onCLS, onINP, onLCP} from 'web-vitals/attribution';\n\nfunction sendToGoogleAnalytics({name, delta, value, id, attribution}) {\n const eventParams = {\n // Built-in params:\n value: delta, // Use `delta` so the value can be summed.\n // Custom params:\n metric_id: id, // Needed to aggregate events.\n metric_value: value, // Optional.\n metric_delta: delta, // Optional.\n };\n\n switch (name) {\n case 'CLS':\n eventParams.debug_target = attribution.largestShiftTarget;\n break;\n case 'INP':\n eventParams.debug_target = attribution.interactionTarget;\n break;\n case 'LCP':\n eventParams.debug_target = attribution.element;\n break;\n }\n\n // Assumes the global `gtag()` function exists, see:\n // https://developers.google.com/analytics/devguides/collection/ga4\n gtag('event', name, eventParams);\n}\n\nonCLS(sendToGoogleAnalytics);\nonINP(sendToGoogleAnalytics);\nonLCP(sendToGoogleAnalytics);\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eonCLS\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eonINP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eonLCP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'web-vitals/attribution'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e \u003cspan class=\"pl-en\"\u003esendToGoogleAnalytics\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003ename\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e delta\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e value\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e id\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e attribution\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eeventParams\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Built-in params:\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003evalue\u003c/span\u003e: \u003cspan class=\"pl-s1\"\u003edelta\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// Use `delta` so the value can be summed.\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Custom params:\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003emetric_id\u003c/span\u003e: \u003cspan class=\"pl-s1\"\u003eid\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// Needed to aggregate events.\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003emetric_value\u003c/span\u003e: \u003cspan class=\"pl-s1\"\u003evalue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// Optional.\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003emetric_delta\u003c/span\u003e: \u003cspan class=\"pl-s1\"\u003edelta\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// Optional.\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n \u003cspan class=\"pl-k\"\u003eswitch\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ename\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003ecase\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'CLS'\u003c/span\u003e:\n \u003cspan class=\"pl-s1\"\u003eeventParams\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003edebug_target\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eattribution\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003elargestShiftTarget\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003ebreak\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003ecase\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'INP'\u003c/span\u003e:\n \u003cspan class=\"pl-s1\"\u003eeventParams\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003edebug_target\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eattribution\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003einteractionTarget\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003ebreak\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003ecase\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'LCP'\u003c/span\u003e:\n \u003cspan class=\"pl-s1\"\u003eeventParams\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003edebug_target\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eattribution\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eelement\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003ebreak\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e// Assumes the global `gtag()` function exists, see:\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// https://developers.google.com/analytics/devguides/collection/ga4\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003egtag\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'event'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ename\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eeventParams\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n\u003cspan class=\"pl-en\"\u003eonCLS\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003esendToGoogleAnalytics\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003eonINP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003esendToGoogleAnalytics\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003eonLCP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003esendToGoogleAnalytics\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-alert markdown-alert-note\" dir=\"auto\"\u003e\u003cp class=\"markdown-alert-title\" dir=\"auto\"\u003e\u003csvg class=\"octicon octicon-info mr-2\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z\"\u003e\u003c/path\u003e\u003c/svg\u003eNote\u003c/p\u003e\u003cp dir=\"auto\"\u003eThis example relies on custom \u003ca href=\"https://support.google.com/analytics/answer/11396839\" rel=\"nofollow\"\u003eevent parameters\u003c/a\u003e in Google Analytics 4.\u003c/p\u003e\n\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSee \u003ca href=\"https://web.dev/articles/debug-performance-in-the-field\" rel=\"nofollow\"\u003eDebug performance in the field\u003c/a\u003e for more information and examples.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBatch multiple reports together\u003c/h3\u003e\u003ca id=\"user-content-batch-multiple-reports-together\" class=\"anchor\" aria-label=\"Permalink: Batch multiple reports together\" href=\"#batch-multiple-reports-together\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eRather than reporting each individual Web Vitals metric separately, you can minimize your network usage by batching multiple metric reports together in a single network request.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eHowever, since not all Web Vitals metrics become available at the same time, and since not all metrics are reported on every page, you cannot simply defer reporting until all metrics are available.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eInstead, you should keep a queue of all metrics that were reported and flush the queue whenever the page is backgrounded or unloaded:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import {onCLS, onINP, onLCP} from 'web-vitals';\n\nconst queue = new Set();\nfunction addToQueue(metric) {\n queue.add(metric);\n}\n\nfunction flushQueue() {\n if (queue.size \u0026gt; 0) {\n // Replace with whatever serialization method you prefer.\n // Note: JSON.stringify will likely include more data than you need.\n const body = JSON.stringify([...queue]);\n\n // Use `navigator.sendBeacon()` if available, falling back to `fetch()`.\n (navigator.sendBeacon \u0026amp;\u0026amp; navigator.sendBeacon('/analytics', body)) ||\n fetch('/analytics', {body, method: 'POST', keepalive: true});\n\n queue.clear();\n }\n}\n\nonCLS(addToQueue);\nonINP(addToQueue);\nonLCP(addToQueue);\n\n// Report all available metrics whenever the page is backgrounded or unloaded.\naddEventListener('visibilitychange', () =\u0026gt; {\n if (document.visibilityState === 'hidden') {\n flushQueue();\n }\n});\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eonCLS\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eonINP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eonLCP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'web-vitals'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003equeue\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eSet\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eaddToQueue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003emetric\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003equeue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eadd\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003emetric\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n\u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eflushQueue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003equeue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003esize\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e0\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Replace with whatever serialization method you prefer.\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Note: JSON.stringify will likely include more data than you need.\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ebody\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eJSON\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003estringify\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e...\u003cspan class=\"pl-s1\"\u003equeue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e// Use `navigator.sendBeacon()` if available, falling back to `fetch()`.\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003enavigator\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003esendBeacon\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e\u0026amp;\u0026amp;\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003enavigator\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003esendBeacon\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'/analytics'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003ebody\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e||\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003efetch\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'/analytics'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003ebody\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003emethod\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e'POST'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003ekeepalive\u003c/span\u003e: \u003cspan class=\"pl-c1\"\u003etrue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n \u003cspan class=\"pl-s1\"\u003equeue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eclear\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\n\u003cspan class=\"pl-en\"\u003eonCLS\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eaddToQueue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003eonINP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eaddToQueue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003eonLCP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eaddToQueue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-c\"\u003e// Report all available metrics whenever the page is backgrounded or unloaded.\u003c/span\u003e\n\u003cspan class=\"pl-en\"\u003eaddEventListener\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'visibilitychange'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003edocument\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003evisibilityState\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e===\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'hidden'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-en\"\u003eflushQueue\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-alert markdown-alert-note\" dir=\"auto\"\u003e\u003cp class=\"markdown-alert-title\" dir=\"auto\"\u003e\u003csvg class=\"octicon octicon-info mr-2\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z\"\u003e\u003c/path\u003e\u003c/svg\u003eNote\u003c/p\u003e\u003cp dir=\"auto\"\u003eSee \u003ca href=\"https://developers.google.com/web/updates/2018/07/page-lifecycle-api#legacy-lifecycle-apis-to-avoid\" rel=\"nofollow\"\u003ethe Page Lifecycle guide\u003c/a\u003e for an explanation of why \u003ccode\u003evisibilitychange\u003c/code\u003e is recommended over events like \u003ccode\u003ebeforeunload\u003c/code\u003e and \u003ccode\u003eunload\u003c/code\u003e.\u003c/p\u003e\n\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca name=\"user-content-bundle-versions\"\u003e\u003c/a\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBuild options\u003c/h2\u003e\u003ca id=\"user-content-build-options\" class=\"anchor\" aria-label=\"Permalink: Build options\" href=\"#build-options\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003eweb-vitals\u003c/code\u003e package includes both \"standard\" and \"attribution\" builds, as well as different formats of each to allow developers to choose the format that best meets their needs or integrates with their architecture.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe following table lists all the builds distributed with the \u003ccode\u003eweb-vitals\u003c/code\u003e package on npm.\u003c/p\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n \u003ctbody\u003e\u003ctr\u003e\n \u003ctd width=\"35%\"\u003e\n \u003cstrong\u003eFilename\u003c/strong\u003e \u003cem\u003e(all within \u003ccode\u003edist/*\u003c/code\u003e)\u003c/em\u003e\n \u003c/td\u003e\n \u003ctd\u003e\u003cstrong\u003eExport\u003c/strong\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cstrong\u003eDescription\u003c/strong\u003e\u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003ccode\u003eweb-vitals.js\u003c/code\u003e\u003c/td\u003e\n \u003ctd\u003e\u003ccode\u003epkg.module\u003c/code\u003e\u003c/td\u003e\n \u003ctd\u003e\n \u003cp dir=\"auto\"\u003eAn ES module bundle of all metric functions, without any attribution features.\u003c/p\u003e\n This is the \"standard\" build and is the simplest way to consume this library out of the box.\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003ccode\u003eweb-vitals.umd.cjs\u003c/code\u003e\u003c/td\u003e\n \u003ctd\u003e\u003ccode\u003epkg.main\u003c/code\u003e\u003c/td\u003e\n \u003ctd\u003e\n A UMD version of the \u003ccode\u003eweb-vitals.js\u003c/code\u003e bundle (exposed on the \u003ccode\u003eself.webVitals.*\u003c/code\u003e namespace).\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003ccode\u003eweb-vitals.iife.js\u003c/code\u003e\u003c/td\u003e\n \u003ctd\u003e--\u003c/td\u003e\n \u003ctd\u003e\n An IIFE version of the \u003ccode\u003eweb-vitals.js\u003c/code\u003e bundle (exposed on the \u003ccode\u003eself.webVitals.*\u003c/code\u003e namespace).\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003ccode\u003eweb-vitals.attribution.js\u003c/code\u003e\u003c/td\u003e\n \u003ctd\u003e--\u003c/td\u003e\n \u003ctd\u003e\n An ES module version of all metric functions that includes \u003ca href=\"#attribution-build\"\u003eattribution\u003c/a\u003e features.\n \u003c/td\u003e\n \u003c/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003ccode\u003eweb-vitals.attribution.umd.cjs\u003c/code\u003e\u003c/td\u003e\n \u003ctd\u003e--\u003c/td\u003e\n \u003ctd\u003e\n A UMD version of the \u003ccode\u003eweb-vitals.attribution.js\u003c/code\u003e build (exposed on the \u003ccode\u003eself.webVitals.*\u003c/code\u003e namespace).\n \u003c/td\u003e\n \u003c/tr\u003e\n \n \u003ctr\u003e\n \u003ctd\u003e\u003ccode\u003eweb-vitals.attribution.iife.js\u003c/code\u003e\u003c/td\u003e\n \u003ctd\u003e--\u003c/td\u003e\n \u003ctd\u003e\n An IIFE version of the \u003ccode\u003eweb-vitals.attribution.js\u003c/code\u003e build (exposed on the \u003ccode\u003eself.webVitals.*\u003c/code\u003e namespace).\n \u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cp dir=\"auto\"\u003e\u003ca name=\"user-content-which-build-is-right-for-you\"\u003e\u003c/a\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWhich build is right for you?\u003c/h3\u003e\u003ca id=\"user-content-which-build-is-right-for-you\" class=\"anchor\" aria-label=\"Permalink: Which build is right for you?\" href=\"#which-build-is-right-for-you\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eMost developers will generally want to use \"standard\" build (via either the ES module or UMD version, depending on your bundler/build system), as it's the easiest to use out of the box and integrate into existing tools.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eHowever, if you'd lke to collect additional debug information to help you diagnose performance bottlenecks based on real-user issues, use the \u003ca href=\"#attribution-build\"\u003e\"attribution\" build\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFor guidance on how to collect and use real-user data to debug performance issues, see \u003ca href=\"https://web.dev/debug-performance-in-the-field/\" rel=\"nofollow\"\u003eDebug performance in the field\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAPI\u003c/h2\u003e\u003ca id=\"user-content-api\" class=\"anchor\" aria-label=\"Permalink: API\" href=\"#api\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eTypes:\u003c/h3\u003e\u003ca id=\"user-content-types\" class=\"anchor\" aria-label=\"Permalink: Types:\" href=\"#types\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ccode\u003eMetric\u003c/code\u003e\u003c/h4\u003e\u003ca id=\"user-content-metric\" class=\"anchor\" aria-label=\"Permalink: Metric\" href=\"#metric\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAll metrics types inherit from the following base interface:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"interface Metric {\n /**\n * The name of the metric (in acronym form).\n */\n name: 'CLS' | 'FCP' | 'FID' | 'INP' | 'LCP' | 'TTFB';\n\n /**\n * The current value of the metric.\n */\n value: number;\n\n /**\n * The rating as to whether the metric value is within the \u0026quot;good\u0026quot;,\n * \u0026quot;needs improvement\u0026quot;, or \u0026quot;poor\u0026quot; thresholds of the metric.\n */\n rating: 'good' | 'needs-improvement' | 'poor';\n\n /**\n * The delta between the current value and the last-reported value.\n * On the first report, `delta` and `value` will always be the same.\n */\n delta: number;\n\n /**\n * A unique ID representing this particular metric instance. This ID can\n * be used by an analytics tool to dedupe multiple values sent for the same\n * metric instance, or to group multiple deltas together and calculate a\n * total. It can also be used to differentiate multiple different metric\n * instances sent from the same page, which can happen if the page is\n * restored from the back/forward cache (in that case new metrics object\n * get created).\n */\n id: string;\n\n /**\n * Any performance entries relevant to the metric value calculation.\n * The array may also be empty if the metric value was not based on any\n * entries (e.g. a CLS value of 0 given no layout shifts).\n */\n entries: PerformanceEntry[];\n\n /**\n * The type of navigation.\n *\n * This will be the value returned by the Navigation Timing API (or\n * `undefined` if the browser doesn't support that API), with the following\n * exceptions:\n * - 'back-forward-cache': for pages that are restored from the bfcache.\n * - 'back_forward' is renamed to 'back-forward' for consistency.\n * - 'prerender': for pages that were prerendered.\n * - 'restore': for pages that were discarded by the browser and then\n * restored by the user.\n */\n navigationType:\n | 'navigate'\n | 'reload'\n | 'back-forward'\n | 'back-forward-cache'\n | 'prerender'\n | 'restore';\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eMetric\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The name of the metric (in acronym form).\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003ename\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e'CLS'\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'FCP'\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'FID'\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'INP'\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'LCP'\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'TTFB'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The current value of the metric.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003evalue\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003enumber\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The rating as to whether the metric value is within the \"good\",\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * \"needs improvement\", or \"poor\" thresholds of the metric.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003erating\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e'good'\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'needs-improvement'\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'poor'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The delta between the current value and the last-reported value.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * On the first report, `delta` and `value` will always be the same.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003edelta\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003enumber\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * A unique ID representing this particular metric instance. This ID can\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * be used by an analytics tool to dedupe multiple values sent for the same\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * metric instance, or to group multiple deltas together and calculate a\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * total. It can also be used to differentiate multiple different metric\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * instances sent from the same page, which can happen if the page is\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * restored from the back/forward cache (in that case new metrics object\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * get created).\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eid\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003estring\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * Any performance entries relevant to the metric value calculation.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The array may also be empty if the metric value was not based on any\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * entries (e.g. a CLS value of 0 given no layout shifts).\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eentries\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003ePerformanceEntry\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The type of navigation.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e *\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * This will be the value returned by the Navigation Timing API (or\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * `undefined` if the browser doesn't support that API), with the following\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * exceptions:\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * - 'back-forward-cache': for pages that are restored from the bfcache.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * - 'back_forward' is renamed to 'back-forward' for consistency.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * - 'prerender': for pages that were prerendered.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * - 'restore': for pages that were discarded by the browser and then\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * restored by the user.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003enavigationType\u003c/span\u003e:\n \u003cspan class=\"pl-c1\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'navigate'\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'reload'\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'back-forward'\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'back-forward-cache'\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'prerender'\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'restore'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eMetric-specific subclasses:\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch5 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ccode\u003eCLSMetric\u003c/code\u003e\u003c/h5\u003e\u003ca id=\"user-content-clsmetric\" class=\"anchor\" aria-label=\"Permalink: CLSMetric\" href=\"#clsmetric\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"interface CLSMetric extends Metric {\n name: 'CLS';\n entries: LayoutShift[];\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eCLSMetric\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eMetric\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003ename\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e'CLS'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eentries\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003eLayoutShift\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch5 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ccode\u003eFCPMetric\u003c/code\u003e\u003c/h5\u003e\u003ca id=\"user-content-fcpmetric\" class=\"anchor\" aria-label=\"Permalink: FCPMetric\" href=\"#fcpmetric\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"interface FCPMetric extends Metric {\n name: 'FCP';\n entries: PerformancePaintTiming[];\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFCPMetric\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eMetric\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003ename\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e'FCP'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eentries\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003ePerformancePaintTiming\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch5 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ccode\u003eFIDMetric\u003c/code\u003e\u003c/h5\u003e\u003ca id=\"user-content-fidmetric\" class=\"anchor\" aria-label=\"Permalink: FIDMetric\" href=\"#fidmetric\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-alert markdown-alert-caution\" dir=\"auto\"\u003e\u003cp class=\"markdown-alert-title\" dir=\"auto\"\u003e\u003csvg class=\"octicon octicon-stop mr-2\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"M4.47.22A.749.749 0 0 1 5 0h6c.199 0 .389.079.53.22l4.25 4.25c.141.14.22.331.22.53v6a.749.749 0 0 1-.22.53l-4.25 4.25A.749.749 0 0 1 11 16H5a.749.749 0 0 1-.53-.22L.22 11.53A.749.749 0 0 1 0 11V5c0-.199.079-.389.22-.53Zm.84 1.28L1.5 5.31v5.38l3.81 3.81h5.38l3.81-3.81V5.31L10.69 1.5ZM8 4a.75.75 0 0 1 .75.75v3.5a.75.75 0 0 1-1.5 0v-3.5A.75.75 0 0 1 8 4Zm0 8a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z\"\u003e\u003c/path\u003e\u003c/svg\u003eCaution\u003c/p\u003e\u003cp dir=\"auto\"\u003eThis interface is deprecated and will be removed in the next major release.\u003c/p\u003e\n\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"interface FIDMetric extends Metric {\n name: 'FID';\n entries: PerformanceEventTiming[];\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFIDMetric\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eMetric\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003ename\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e'FID'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eentries\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003ePerformanceEventTiming\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch5 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ccode\u003eINPMetric\u003c/code\u003e\u003c/h5\u003e\u003ca id=\"user-content-inpmetric\" class=\"anchor\" aria-label=\"Permalink: INPMetric\" href=\"#inpmetric\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"interface INPMetric extends Metric {\n name: 'INP';\n entries: PerformanceEventTiming[];\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eINPMetric\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eMetric\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003ename\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e'INP'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eentries\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003ePerformanceEventTiming\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch5 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ccode\u003eLCPMetric\u003c/code\u003e\u003c/h5\u003e\u003ca id=\"user-content-lcpmetric\" class=\"anchor\" aria-label=\"Permalink: LCPMetric\" href=\"#lcpmetric\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"interface LCPMetric extends Metric {\n name: 'LCP';\n entries: LargestContentfulPaint[];\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eLCPMetric\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eMetric\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003ename\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e'LCP'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eentries\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003eLargestContentfulPaint\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch5 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ccode\u003eTTFBMetric\u003c/code\u003e\u003c/h5\u003e\u003ca id=\"user-content-ttfbmetric\" class=\"anchor\" aria-label=\"Permalink: TTFBMetric\" href=\"#ttfbmetric\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"interface TTFBMetric extends Metric {\n name: 'TTFB';\n entries: PerformanceNavigationTiming[];\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eTTFBMetric\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eextends\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eMetric\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003ename\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e'TTFB'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eentries\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003ePerformanceNavigationTiming\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ccode\u003eMetricRatingThresholds\u003c/code\u003e\u003c/h4\u003e\u003ca id=\"user-content-metricratingthresholds\" class=\"anchor\" aria-label=\"Permalink: MetricRatingThresholds\" href=\"#metricratingthresholds\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe thresholds of metric's \"good\", \"needs improvement\", and \"poor\" ratings.\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eMetric values up to and including [0] are rated \"good\"\u003c/li\u003e\n\u003cli\u003eMetric values up to and including [1] are rated \"needs improvement\"\u003c/li\u003e\n\u003cli\u003eMetric values above [1] are \"poor\"\u003c/li\u003e\n\u003c/ul\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eMetric value\u003c/th\u003e\n\u003cth\u003eRating\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e≦ [0]\u003c/td\u003e\n\u003ctd\u003e\"good\"\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u0026gt; [0] and ≦ [1]\u003c/td\u003e\n\u003ctd\u003e\"needs improvement\"\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u0026gt; [1]\u003c/td\u003e\n\u003ctd\u003e\"poor\"\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"type MetricRatingThresholds = [number, number];\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003etype\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eMetricRatingThresholds\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003enumber\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003enumber\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cem\u003eSee also \u003ca href=\"#rating-thresholds\"\u003eRating Thresholds\u003c/a\u003e.\u003c/em\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ccode\u003eReportOpts\u003c/code\u003e\u003c/h4\u003e\u003ca id=\"user-content-reportopts\" class=\"anchor\" aria-label=\"Permalink: ReportOpts\" href=\"#reportopts\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"interface ReportOpts {\n reportAllChanges?: boolean;\n durationThreshold?: number;\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eReportOpts\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003ereportAllChanges\u003c/span\u003e?: \u003cspan class=\"pl-smi\"\u003eboolean\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003edurationThreshold\u003c/span\u003e?: \u003cspan class=\"pl-smi\"\u003enumber\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ccode\u003eLoadState\u003c/code\u003e\u003c/h4\u003e\u003ca id=\"user-content-loadstate\" class=\"anchor\" aria-label=\"Permalink: LoadState\" href=\"#loadstate\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003eLoadState\u003c/code\u003e type is used in several of the metric \u003ca href=\"#attribution\"\u003eattribution objects\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"/**\n * The loading state of the document. Note: this value is similar to\n * `document.readyState` but it subdivides the \u0026quot;interactive\u0026quot; state into the\n * time before and after the DOMContentLoaded event fires.\n *\n * State descriptions:\n * - `loading`: the initial document response has not yet been fully downloaded\n * and parsed. This is equivalent to the corresponding `readyState` value.\n * - `dom-interactive`: the document has been fully loaded and parsed, but\n * scripts may not have yet finished loading and executing.\n * - `dom-content-loaded`: the document is fully loaded and parsed, and all\n * scripts (except `async` scripts) have loaded and finished executing.\n * - `complete`: the document and all of its sub-resources have finished\n * loading. This is equivalent to the corresponding `readyState` value.\n */\ntype LoadState =\n | 'loading'\n | 'dom-interactive'\n | 'dom-content-loaded'\n | 'complete';\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The loading state of the document. Note: this value is similar to\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * `document.readyState` but it subdivides the \"interactive\" state into the\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * time before and after the DOMContentLoaded event fires.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e *\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * State descriptions:\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * - `loading`: the initial document response has not yet been fully downloaded\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * and parsed. This is equivalent to the corresponding `readyState` value.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * - `dom-interactive`: the document has been fully loaded and parsed, but\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * scripts may not have yet finished loading and executing.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * - `dom-content-loaded`: the document is fully loaded and parsed, and all\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * scripts (except `async` scripts) have loaded and finished executing.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * - `complete`: the document and all of its sub-resources have finished\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * loading. This is equivalent to the corresponding `readyState` value.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n\u003cspan class=\"pl-k\"\u003etype\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eLoadState\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'loading'\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'dom-interactive'\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'dom-content-loaded'\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'complete'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eFunctions:\u003c/h3\u003e\u003ca id=\"user-content-functions\" class=\"anchor\" aria-label=\"Permalink: Functions:\" href=\"#functions\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ccode\u003eonCLS()\u003c/code\u003e\u003c/h4\u003e\u003ca id=\"user-content-oncls\" class=\"anchor\" aria-label=\"Permalink: onCLS()\" href=\"#oncls\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"function onCLS(callback: (metric: CLSMetric) =\u0026gt; void, opts?: ReportOpts): void;\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eonCLS\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ecallback\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003emetric\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003eCLSMetric\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003e\u003cspan class=\"pl-k\"\u003evoid\u003c/span\u003e\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eopts\u003c/span\u003e?: \u003cspan class=\"pl-smi\"\u003eReportOpts\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003e\u003cspan class=\"pl-k\"\u003evoid\u003c/span\u003e\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eCalculates the \u003ca href=\"https://web.dev/articles/cls\" rel=\"nofollow\"\u003eCLS\u003c/a\u003e value for the current page and calls the \u003ccode\u003ecallback\u003c/code\u003e function once the value is ready to be reported, along with all \u003ccode\u003elayout-shift\u003c/code\u003e performance entries that were used in the metric value calculation. The reported value is a \u003ca href=\"https://heycam.github.io/webidl/#idl-double\" rel=\"nofollow\"\u003edouble\u003c/a\u003e (corresponding to a \u003ca href=\"https://web.dev/articles/cls#layout_shift_score\" rel=\"nofollow\"\u003elayout shift score\u003c/a\u003e).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf the \u003ccode\u003ereportAllChanges\u003c/code\u003e \u003ca href=\"#reportopts\"\u003econfiguration option\u003c/a\u003e is set to \u003ccode\u003etrue\u003c/code\u003e, the \u003ccode\u003ecallback\u003c/code\u003e function will be called as soon as the value is initially determined as well as any time the value changes throughout the page lifespan (Note \u003ca href=\"#report-the-value-on-every-change\"\u003enot necessarily for every layout shift\u003c/a\u003e).\u003c/p\u003e\n\u003cdiv class=\"markdown-alert markdown-alert-important\" dir=\"auto\"\u003e\u003cp class=\"markdown-alert-title\" dir=\"auto\"\u003e\u003csvg class=\"octicon octicon-report mr-2\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"M0 1.75C0 .784.784 0 1.75 0h12.5C15.216 0 16 .784 16 1.75v9.5A1.75 1.75 0 0 1 14.25 13H8.06l-2.573 2.573A1.458 1.458 0 0 1 3 14.543V13H1.75A1.75 1.75 0 0 1 0 11.25Zm1.75-.25a.25.25 0 0 0-.25.25v9.5c0 .138.112.25.25.25h2a.75.75 0 0 1 .75.75v2.19l2.72-2.72a.749.749 0 0 1 .53-.22h6.5a.25.25 0 0 0 .25-.25v-9.5a.25.25 0 0 0-.25-.25Zm7 2.25v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 9a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z\"\u003e\u003c/path\u003e\u003c/svg\u003eImportant\u003c/p\u003e\u003cp dir=\"auto\"\u003eCLS should be continually monitored for changes throughout the entire lifespan of a page—including if the user returns to the page after it's been hidden/backgrounded. However, since browsers often \u003ca href=\"https://developer.chrome.com/blog/page-lifecycle-api/#advice-hidden\" rel=\"nofollow\"\u003ewill not fire additional callbacks once the user has backgrounded a page\u003c/a\u003e, \u003ccode\u003ecallback\u003c/code\u003e is always called when the page's visibility state changes to hidden. As a result, the \u003ccode\u003ecallback\u003c/code\u003e function might be called multiple times during the same page load (see \u003ca href=\"#report-only-the-delta-of-changes\"\u003eReporting only the delta of changes\u003c/a\u003e for how to manage this).\u003c/p\u003e\n\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ccode\u003eonFCP()\u003c/code\u003e\u003c/h4\u003e\u003ca id=\"user-content-onfcp\" class=\"anchor\" aria-label=\"Permalink: onFCP()\" href=\"#onfcp\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"function onFCP(callback: (metric: FCPMetric) =\u0026gt; void, opts?: ReportOpts): void;\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eonFCP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ecallback\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003emetric\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003eFCPMetric\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003e\u003cspan class=\"pl-k\"\u003evoid\u003c/span\u003e\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eopts\u003c/span\u003e?: \u003cspan class=\"pl-smi\"\u003eReportOpts\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003e\u003cspan class=\"pl-k\"\u003evoid\u003c/span\u003e\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eCalculates the \u003ca href=\"https://web.dev/articles/fcp\" rel=\"nofollow\"\u003eFCP\u003c/a\u003e value for the current page and calls the \u003ccode\u003ecallback\u003c/code\u003e function once the value is ready, along with the relevant \u003ccode\u003epaint\u003c/code\u003e performance entry used to determine the value. The reported value is a \u003ca href=\"https://developer.mozilla.org/docs/Web/API/DOMHighResTimeStamp\" rel=\"nofollow\"\u003e\u003ccode\u003eDOMHighResTimeStamp\u003c/code\u003e\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ccode\u003eonFID()\u003c/code\u003e\u003c/h4\u003e\u003ca id=\"user-content-onfid\" class=\"anchor\" aria-label=\"Permalink: onFID()\" href=\"#onfid\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-alert markdown-alert-caution\" dir=\"auto\"\u003e\u003cp class=\"markdown-alert-title\" dir=\"auto\"\u003e\u003csvg class=\"octicon octicon-stop mr-2\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"M4.47.22A.749.749 0 0 1 5 0h6c.199 0 .389.079.53.22l4.25 4.25c.141.14.22.331.22.53v6a.749.749 0 0 1-.22.53l-4.25 4.25A.749.749 0 0 1 11 16H5a.749.749 0 0 1-.53-.22L.22 11.53A.749.749 0 0 1 0 11V5c0-.199.079-.389.22-.53Zm.84 1.28L1.5 5.31v5.38l3.81 3.81h5.38l3.81-3.81V5.31L10.69 1.5ZM8 4a.75.75 0 0 1 .75.75v3.5a.75.75 0 0 1-1.5 0v-3.5A.75.75 0 0 1 8 4Zm0 8a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z\"\u003e\u003c/path\u003e\u003c/svg\u003eCaution\u003c/p\u003e\u003cp dir=\"auto\"\u003eThis function is deprecated and will be removed in the next major release.\u003c/p\u003e\n\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"function onFID(callback: (metric: FIDMetric) =\u0026gt; void, opts?: ReportOpts): void;\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eonFID\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ecallback\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003emetric\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003eFIDMetric\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003e\u003cspan class=\"pl-k\"\u003evoid\u003c/span\u003e\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eopts\u003c/span\u003e?: \u003cspan class=\"pl-smi\"\u003eReportOpts\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003e\u003cspan class=\"pl-k\"\u003evoid\u003c/span\u003e\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eCalculates the \u003ca href=\"https://web.dev/articles/fid\" rel=\"nofollow\"\u003eFID\u003c/a\u003e value for the current page and calls the \u003ccode\u003ecallback\u003c/code\u003e function once the value is ready, along with the relevant \u003ccode\u003efirst-input\u003c/code\u003e performance entry used to determine the value. The reported value is a \u003ca href=\"https://developer.mozilla.org/docs/Web/API/DOMHighResTimeStamp\" rel=\"nofollow\"\u003e\u003ccode\u003eDOMHighResTimeStamp\u003c/code\u003e\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-alert markdown-alert-important\" dir=\"auto\"\u003e\u003cp class=\"markdown-alert-title\" dir=\"auto\"\u003e\u003csvg class=\"octicon octicon-report mr-2\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"M0 1.75C0 .784.784 0 1.75 0h12.5C15.216 0 16 .784 16 1.75v9.5A1.75 1.75 0 0 1 14.25 13H8.06l-2.573 2.573A1.458 1.458 0 0 1 3 14.543V13H1.75A1.75 1.75 0 0 1 0 11.25Zm1.75-.25a.25.25 0 0 0-.25.25v9.5c0 .138.112.25.25.25h2a.75.75 0 0 1 .75.75v2.19l2.72-2.72a.749.749 0 0 1 .53-.22h6.5a.25.25 0 0 0 .25-.25v-9.5a.25.25 0 0 0-.25-.25Zm7 2.25v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 9a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z\"\u003e\u003c/path\u003e\u003c/svg\u003eImportant\u003c/p\u003e\u003cp dir=\"auto\"\u003eSince FID is only reported after the user interacts with the page, it's possible that it will not be reported for some page loads.\u003c/p\u003e\n\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ccode\u003eonINP()\u003c/code\u003e\u003c/h4\u003e\u003ca id=\"user-content-oninp\" class=\"anchor\" aria-label=\"Permalink: onINP()\" href=\"#oninp\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"function onINP(callback: (metric: INPMetric) =\u0026gt; void, opts?: ReportOpts): void;\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eonINP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ecallback\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003emetric\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003eINPMetric\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003e\u003cspan class=\"pl-k\"\u003evoid\u003c/span\u003e\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eopts\u003c/span\u003e?: \u003cspan class=\"pl-smi\"\u003eReportOpts\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003e\u003cspan class=\"pl-k\"\u003evoid\u003c/span\u003e\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eCalculates the \u003ca href=\"https://web.dev/articles/inp\" rel=\"nofollow\"\u003eINP\u003c/a\u003e value for the current page and calls the \u003ccode\u003ecallback\u003c/code\u003e function once the value is ready, along with the \u003ccode\u003eevent\u003c/code\u003e performance entries reported for that interaction. The reported value is a \u003ca href=\"https://developer.mozilla.org/docs/Web/API/DOMHighResTimeStamp\" rel=\"nofollow\"\u003e\u003ccode\u003eDOMHighResTimeStamp\u003c/code\u003e\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eA custom \u003ccode\u003edurationThreshold\u003c/code\u003e \u003ca href=\"#reportopts\"\u003econfiguration option\u003c/a\u003e can optionally be passed to control what \u003ccode\u003eevent-timing\u003c/code\u003e entries are considered for INP reporting. The default threshold is \u003ccode\u003e40\u003c/code\u003e, which means INP scores of less than 40 are reported as 0. Note that this will not affect your 75th percentile INP value unless that value is also less than 40 (well below the recommended \u003ca href=\"https://web.dev/articles/inp#what_is_a_good_inp_score\" rel=\"nofollow\"\u003egood\u003c/a\u003e threshold).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf the \u003ccode\u003ereportAllChanges\u003c/code\u003e \u003ca href=\"#reportopts\"\u003econfiguration option\u003c/a\u003e is set to \u003ccode\u003etrue\u003c/code\u003e, the \u003ccode\u003ecallback\u003c/code\u003e function will be called as soon as the value is initially determined as well as any time the value changes throughout the page lifespan (Note \u003ca href=\"#report-the-value-on-every-change\"\u003enot necessarily for every interaction\u003c/a\u003e).\u003c/p\u003e\n\u003cdiv class=\"markdown-alert markdown-alert-important\" dir=\"auto\"\u003e\u003cp class=\"markdown-alert-title\" dir=\"auto\"\u003e\u003csvg class=\"octicon octicon-report mr-2\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"M0 1.75C0 .784.784 0 1.75 0h12.5C15.216 0 16 .784 16 1.75v9.5A1.75 1.75 0 0 1 14.25 13H8.06l-2.573 2.573A1.458 1.458 0 0 1 3 14.543V13H1.75A1.75 1.75 0 0 1 0 11.25Zm1.75-.25a.25.25 0 0 0-.25.25v9.5c0 .138.112.25.25.25h2a.75.75 0 0 1 .75.75v2.19l2.72-2.72a.749.749 0 0 1 .53-.22h6.5a.25.25 0 0 0 .25-.25v-9.5a.25.25 0 0 0-.25-.25Zm7 2.25v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 9a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z\"\u003e\u003c/path\u003e\u003c/svg\u003eImportant\u003c/p\u003e\u003cp dir=\"auto\"\u003eINP should be continually monitored for changes throughout the entire lifespan of a page—including if the user returns to the page after it's been hidden/backgrounded. However, since browsers often \u003ca href=\"https://developer.chrome.com/blog/page-lifecycle-api/#advice-hidden\" rel=\"nofollow\"\u003ewill not fire additional callbacks once the user has backgrounded a page\u003c/a\u003e, \u003ccode\u003ecallback\u003c/code\u003e is always called when the page's visibility state changes to hidden. As a result, the \u003ccode\u003ecallback\u003c/code\u003e function might be called multiple times during the same page load (see \u003ca href=\"#report-only-the-delta-of-changes\"\u003eReporting only the delta of changes\u003c/a\u003e for how to manage this).\u003c/p\u003e\n\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ccode\u003eonLCP()\u003c/code\u003e\u003c/h4\u003e\u003ca id=\"user-content-onlcp\" class=\"anchor\" aria-label=\"Permalink: onLCP()\" href=\"#onlcp\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"function onLCP(callback: (metric: LCPMetric) =\u0026gt; void, opts?: ReportOpts): void;\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eonLCP\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003ecallback\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003emetric\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003eLCPMetric\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003e\u003cspan class=\"pl-k\"\u003evoid\u003c/span\u003e\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eopts\u003c/span\u003e?: \u003cspan class=\"pl-smi\"\u003eReportOpts\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003e\u003cspan class=\"pl-k\"\u003evoid\u003c/span\u003e\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eCalculates the \u003ca href=\"https://web.dev/articles/lcp\" rel=\"nofollow\"\u003eLCP\u003c/a\u003e value for the current page and calls the \u003ccode\u003ecallback\u003c/code\u003e function once the value is ready (along with the relevant \u003ccode\u003elargest-contentful-paint\u003c/code\u003e performance entry used to determine the value). The reported value is a \u003ca href=\"https://developer.mozilla.org/docs/Web/API/DOMHighResTimeStamp\" rel=\"nofollow\"\u003e\u003ccode\u003eDOMHighResTimeStamp\u003c/code\u003e\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf the \u003ccode\u003ereportAllChanges\u003c/code\u003e \u003ca href=\"#reportopts\"\u003econfiguration option\u003c/a\u003e is set to \u003ccode\u003etrue\u003c/code\u003e, the \u003ccode\u003ecallback\u003c/code\u003e function will be called any time a new \u003ccode\u003elargest-contentful-paint\u003c/code\u003e performance entry is dispatched, or once the final value of the metric has been determined.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ccode\u003eonTTFB()\u003c/code\u003e\u003c/h4\u003e\u003ca id=\"user-content-onttfb\" class=\"anchor\" aria-label=\"Permalink: onTTFB()\" href=\"#onttfb\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"function onTTFB(\n callback: (metric: TTFBMetric) =\u0026gt; void,\n opts?: ReportOpts,\n): void;\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eonTTFB\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003ecallback\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003emetric\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003eTTFBMetric\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003e\u003cspan class=\"pl-k\"\u003evoid\u003c/span\u003e\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003eopts\u003c/span\u003e?: \u003cspan class=\"pl-smi\"\u003eReportOpts\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003e\u003cspan class=\"pl-k\"\u003evoid\u003c/span\u003e\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eCalculates the \u003ca href=\"https://web.dev/articles/ttfb\" rel=\"nofollow\"\u003eTTFB\u003c/a\u003e value for the current page and calls the \u003ccode\u003ecallback\u003c/code\u003e function once the page has loaded, along with the relevant \u003ccode\u003enavigation\u003c/code\u003e performance entry used to determine the value. The reported value is a \u003ca href=\"https://developer.mozilla.org/docs/Web/API/DOMHighResTimeStamp\" rel=\"nofollow\"\u003e\u003ccode\u003eDOMHighResTimeStamp\u003c/code\u003e\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eNote, this function waits until after the page is loaded to call \u003ccode\u003ecallback\u003c/code\u003e in order to ensure all properties of the \u003ccode\u003enavigation\u003c/code\u003e entry are populated. This is useful if you want to report on other metrics exposed by the \u003ca href=\"https://w3c.github.io/navigation-timing/\" rel=\"nofollow\"\u003eNavigation Timing API\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFor example, the TTFB metric starts from the page's \u003ca href=\"https://www.w3.org/TR/hr-time-2/#sec-time-origin\" rel=\"nofollow\"\u003etime origin\u003c/a\u003e, which means it includes time spent on DNS lookup, connection negotiation, network latency, and server processing time.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import {onTTFB} from 'web-vitals';\n\nonTTFB((metric) =\u0026gt; {\n // Calculate the request time by subtracting from TTFB\n // everything that happened prior to the request starting.\n const requestTime = metric.value - metric.entries[0].requestStart;\n console.log('Request time:', requestTime);\n});\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eonTTFB\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'web-vitals'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-en\"\u003eonTTFB\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003emetric\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u0026gt;\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// Calculate the request time by subtracting from TTFB\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// everything that happened prior to the request starting.\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003erequestTime\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003emetric\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003evalue\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e-\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003emetric\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eentries\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e0\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003erequestStart\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e'Request time:'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003erequestTime\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-alert markdown-alert-note\" dir=\"auto\"\u003e\u003cp class=\"markdown-alert-title\" dir=\"auto\"\u003e\u003csvg class=\"octicon octicon-info mr-2\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z\"\u003e\u003c/path\u003e\u003c/svg\u003eNote\u003c/p\u003e\u003cp dir=\"auto\"\u003eBrowsers that do not support \u003ccode\u003enavigation\u003c/code\u003e entries will fall back to using \u003ccode\u003eperformance.timing\u003c/code\u003e (with the timestamps converted from epoch time to \u003ca href=\"https://developer.mozilla.org/docs/Web/API/DOMHighResTimeStamp\" rel=\"nofollow\"\u003e\u003ccode\u003eDOMHighResTimeStamp\u003c/code\u003e\u003c/a\u003e). This ensures code referencing these values (like in the example above) will work the same in all browsers.\u003c/p\u003e\n\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eRating Thresholds:\u003c/h3\u003e\u003ca id=\"user-content-rating-thresholds\" class=\"anchor\" aria-label=\"Permalink: Rating Thresholds:\" href=\"#rating-thresholds\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe thresholds of each metric's \"good\", \"needs improvement\", and \"poor\" ratings are available as \u003ca href=\"#metricratingthresholds\"\u003e\u003ccode\u003eMetricRatingThresholds\u003c/code\u003e\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eExample:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"import {CLSThresholds, INPThresholds, LCPThresholds} from 'web-vitals';\n\nconsole.log(CLSThresholds); // [ 0.1, 0.25 ]\nconsole.log(INPThresholds); // [ 200, 500 ]\nconsole.log(LCPThresholds); // [ 2500, 4000 ]\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003eCLSThresholds\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eINPThresholds\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eLCPThresholds\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efrom\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'web-vitals'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003eCLSThresholds\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// [ 0.1, 0.25 ]\u003c/span\u003e\n\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003eINPThresholds\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// [ 200, 500 ]\u003c/span\u003e\n\u003cspan class=\"pl-smi\"\u003econsole\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003elog\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-smi\"\u003eLCPThresholds\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e// [ 2500, 4000 ]\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-alert markdown-alert-note\" dir=\"auto\"\u003e\u003cp class=\"markdown-alert-title\" dir=\"auto\"\u003e\u003csvg class=\"octicon octicon-info mr-2\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z\"\u003e\u003c/path\u003e\u003c/svg\u003eNote\u003c/p\u003e\u003cp dir=\"auto\"\u003eIt's typically not necessary (or recommended) to manually calculate metric value ratings using these thresholds. Use the \u003ca href=\"#metric\"\u003e\u003ccode\u003eMetric['rating']\u003c/code\u003e\u003c/a\u003e instead.\u003c/p\u003e\n\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAttribution:\u003c/h3\u003e\u003ca id=\"user-content-attribution\" class=\"anchor\" aria-label=\"Permalink: Attribution:\" href=\"#attribution\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe following objects contain potentially-helpful debugging information that can be sent along with the metric values for the current page visit in order to help identify issues happening to real-users in the field.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWhen using the attribution build, these objects are found as an \u003ccode\u003eattribution\u003c/code\u003e property on each metric.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSee the \u003ca href=\"#attribution-build\"\u003eattribution build\u003c/a\u003e section for details on how to use this feature.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ccode\u003eCLSAttribution\u003c/code\u003e\u003c/h4\u003e\u003ca id=\"user-content-clsattribution\" class=\"anchor\" aria-label=\"Permalink: CLSAttribution\" href=\"#clsattribution\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"interface CLSAttribution {\n /**\n * A selector identifying the first element (in document order) that\n * shifted when the single largest layout shift contributing to the page's\n * CLS score occurred.\n */\n largestShiftTarget?: string;\n /**\n * The time when the single largest layout shift contributing to the page's\n * CLS score occurred.\n */\n largestShiftTime?: DOMHighResTimeStamp;\n /**\n * The layout shift score of the single largest layout shift contributing to\n * the page's CLS score.\n */\n largestShiftValue?: number;\n /**\n * The `LayoutShiftEntry` representing the single largest layout shift\n * contributing to the page's CLS score. (Useful when you need more than just\n * `largestShiftTarget`, `largestShiftTime`, and `largestShiftValue`).\n */\n largestShiftEntry?: LayoutShift;\n /**\n * The first element source (in document order) among the `sources` list\n * of the `largestShiftEntry` object. (Also useful when you need more than\n * just `largestShiftTarget`, `largestShiftTime`, and `largestShiftValue`).\n */\n largestShiftSource?: LayoutShiftAttribution;\n /**\n * The loading state of the document at the time when the largest layout\n * shift contribution to the page's CLS score occurred (see `LoadState`\n * for details).\n */\n loadState?: LoadState;\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eCLSAttribution\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * A selector identifying the first element (in document order) that\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * shifted when the single largest layout shift contributing to the page's\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * CLS score occurred.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003elargestShiftTarget\u003c/span\u003e?: \u003cspan class=\"pl-smi\"\u003estring\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The time when the single largest layout shift contributing to the page's\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * CLS score occurred.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003elargestShiftTime\u003c/span\u003e?: \u003cspan class=\"pl-smi\"\u003eDOMHighResTimeStamp\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The layout shift score of the single largest layout shift contributing to\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * the page's CLS score.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003elargestShiftValue\u003c/span\u003e?: \u003cspan class=\"pl-smi\"\u003enumber\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The `LayoutShiftEntry` representing the single largest layout shift\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * contributing to the page's CLS score. (Useful when you need more than just\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * `largestShiftTarget`, `largestShiftTime`, and `largestShiftValue`).\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003elargestShiftEntry\u003c/span\u003e?: \u003cspan class=\"pl-smi\"\u003eLayoutShift\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The first element source (in document order) among the `sources` list\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * of the `largestShiftEntry` object. (Also useful when you need more than\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * just `largestShiftTarget`, `largestShiftTime`, and `largestShiftValue`).\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003elargestShiftSource\u003c/span\u003e?: \u003cspan class=\"pl-smi\"\u003eLayoutShiftAttribution\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The loading state of the document at the time when the largest layout\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * shift contribution to the page's CLS score occurred (see `LoadState`\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * for details).\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eloadState\u003c/span\u003e?: \u003cspan class=\"pl-smi\"\u003eLoadState\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ccode\u003eFCPAttribution\u003c/code\u003e\u003c/h4\u003e\u003ca id=\"user-content-fcpattribution\" class=\"anchor\" aria-label=\"Permalink: FCPAttribution\" href=\"#fcpattribution\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"interface FCPAttribution {\n /**\n * The time from when the user initiates loading the page until when the\n * browser receives the first byte of the response (a.k.a. TTFB).\n */\n timeToFirstByte: number;\n /**\n * The delta between TTFB and the first contentful paint (FCP).\n */\n firstByteToFCP: number;\n /**\n * The loading state of the document at the time when FCP `occurred (see\n * `LoadState` for details). Ideally, documents can paint before they finish\n * loading (e.g. the `loading` or `dom-interactive` phases).\n */\n loadState: LoadState;\n /**\n * The `PerformancePaintTiming` entry corresponding to FCP.\n */\n fcpEntry?: PerformancePaintTiming;\n /**\n * The `navigation` entry of the current page, which is useful for diagnosing\n * general page load issues. This can be used to access `serverTiming` for example:\n * navigationEntry?.serverTiming\n */\n navigationEntry?: PerformanceNavigationTiming;\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFCPAttribution\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The time from when the user initiates loading the page until when the\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * browser receives the first byte of the response (a.k.a. TTFB).\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003etimeToFirstByte\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003enumber\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The delta between TTFB and the first contentful paint (FCP).\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003efirstByteToFCP\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003enumber\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The loading state of the document at the time when FCP `occurred (see\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * `LoadState` for details). Ideally, documents can paint before they finish\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * loading (e.g. the `loading` or `dom-interactive` phases).\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eloadState\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003eLoadState\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The `PerformancePaintTiming` entry corresponding to FCP.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003efcpEntry\u003c/span\u003e?: \u003cspan class=\"pl-smi\"\u003ePerformancePaintTiming\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The `navigation` entry of the current page, which is useful for diagnosing\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * general page load issues. This can be used to access `serverTiming` for example:\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * navigationEntry?.serverTiming\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003enavigationEntry\u003c/span\u003e?: \u003cspan class=\"pl-smi\"\u003ePerformanceNavigationTiming\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ccode\u003eFIDAttribution\u003c/code\u003e\u003c/h4\u003e\u003ca id=\"user-content-fidattribution\" class=\"anchor\" aria-label=\"Permalink: FIDAttribution\" href=\"#fidattribution\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-alert markdown-alert-caution\" dir=\"auto\"\u003e\u003cp class=\"markdown-alert-title\" dir=\"auto\"\u003e\u003csvg class=\"octicon octicon-stop mr-2\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"M4.47.22A.749.749 0 0 1 5 0h6c.199 0 .389.079.53.22l4.25 4.25c.141.14.22.331.22.53v6a.749.749 0 0 1-.22.53l-4.25 4.25A.749.749 0 0 1 11 16H5a.749.749 0 0 1-.53-.22L.22 11.53A.749.749 0 0 1 0 11V5c0-.199.079-.389.22-.53Zm.84 1.28L1.5 5.31v5.38l3.81 3.81h5.38l3.81-3.81V5.31L10.69 1.5ZM8 4a.75.75 0 0 1 .75.75v3.5a.75.75 0 0 1-1.5 0v-3.5A.75.75 0 0 1 8 4Zm0 8a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z\"\u003e\u003c/path\u003e\u003c/svg\u003eCaution\u003c/p\u003e\u003cp dir=\"auto\"\u003eThis interface is deprecated and will be removed in the next major release.\u003c/p\u003e\n\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"interface FIDAttribution {\n /**\n * A selector identifying the element that the user interacted with. This\n * element will be the `target` of the `event` dispatched.\n */\n eventTarget: string;\n /**\n * The time when the user interacted. This time will match the `timeStamp`\n * value of the `event` dispatched.\n */\n eventTime: number;\n /**\n * The `type` of the `event` dispatched from the user interaction.\n */\n eventType: string;\n /**\n * The `PerformanceEventTiming` entry corresponding to FID.\n */\n eventEntry: PerformanceEventTiming;\n /**\n * The loading state of the document at the time when the first interaction\n * occurred (see `LoadState` for details). If the first interaction occurred\n * while the document was loading and executing script (e.g. usually in the\n * `dom-interactive` phase) it can result in long input delays.\n */\n loadState: LoadState;\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eFIDAttribution\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * A selector identifying the element that the user interacted with. This\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * element will be the `target` of the `event` dispatched.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eeventTarget\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003estring\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The time when the user interacted. This time will match the `timeStamp`\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * value of the `event` dispatched.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eeventTime\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003enumber\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The `type` of the `event` dispatched from the user interaction.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eeventType\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003estring\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The `PerformanceEventTiming` entry corresponding to FID.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eeventEntry\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003ePerformanceEventTiming\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The loading state of the document at the time when the first interaction\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * occurred (see `LoadState` for details). If the first interaction occurred\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * while the document was loading and executing script (e.g. usually in the\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * `dom-interactive` phase) it can result in long input delays.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eloadState\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003eLoadState\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ccode\u003eINPAttribution\u003c/code\u003e\u003c/h4\u003e\u003ca id=\"user-content-inpattribution\" class=\"anchor\" aria-label=\"Permalink: INPAttribution\" href=\"#inpattribution\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"interface INPAttribution {\n /**\n * A selector identifying the element that the user first interacted with\n * as part of the frame where the INP candidate interaction occurred.\n * If this value is an empty string, that generally means the element was\n * removed from the DOM after the interaction.\n */\n interactionTarget: string;\n /**\n * A reference to the HTML element identified by `interactionTarget`.\n * NOTE: for attribution purpose, a selector identifying the element is\n * typically more useful than the element itself. However, the element is\n * also made available in case additional context is needed.\n */\n interactionTargetElement: Node | undefined;\n /**\n * The time when the user first interacted during the frame where the INP\n * candidate interaction occurred (if more than one interaction occurred\n * within the frame, only the first time is reported).\n */\n interactionTime: DOMHighResTimeStamp;\n /**\n * The best-guess timestamp of the next paint after the interaction.\n * In general, this timestamp is the same as the `startTime + duration` of\n * the event timing entry. However, since `duration` values are rounded to\n * the nearest 8ms, it can sometimes appear that the paint occurred before\n * processing ended (which cannot happen). This value clamps the paint time\n * so it's always after `processingEnd` from the Event Timing API and\n * `renderStart` from the Long Animation Frame API (where available).\n * It also averages the duration values for all entries in the same\n * animation frame, which should be closer to the \u0026quot;real\u0026quot; value.\n */\n nextPaintTime: DOMHighResTimeStamp;\n /**\n * The type of interaction, based on the event type of the `event` entry\n * that corresponds to the interaction (i.e. the first `event` entry\n * containing an `interactionId` dispatched in a given animation frame).\n * For \u0026quot;pointerdown\u0026quot;, \u0026quot;pointerup\u0026quot;, or \u0026quot;click\u0026quot; events this will be \u0026quot;pointer\u0026quot;,\n * and for \u0026quot;keydown\u0026quot; or \u0026quot;keyup\u0026quot; events this will be \u0026quot;keyboard\u0026quot;.\n */\n interactionType: 'pointer' | 'keyboard';\n /**\n * An array of Event Timing entries that were processed within the same\n * animation frame as the INP candidate interaction.\n */\n processedEventEntries: PerformanceEventTiming[];\n /**\n * If the browser supports the Long Animation Frame API, this array will\n * include any `long-animation-frame` entries that intersect with the INP\n * candidate interaction's `startTime` and the `processingEnd` time of the\n * last event processed within that animation frame. If the browser does not\n * support the Long Animation Frame API or no `long-animation-frame` entries\n * are detect, this array will be empty.\n */\n longAnimationFrameEntries: PerformanceLongAnimationFrameTiming[];\n /**\n * The time from when the user interacted with the page until when the\n * browser was first able to start processing event listeners for that\n * interaction. This time captures the delay before event processing can\n * begin due to the main thread being busy with other work.\n */\n inputDelay: number;\n /**\n * The time from when the first event listener started running in response to\n * the user interaction until when all event listener processing has finished.\n */\n processingDuration: number;\n /**\n * The time from when the browser finished processing all event listeners for\n * the user interaction until the next frame is presented on the screen and\n * visible to the user. This time includes work on the main thread (such as\n * `requestAnimationFrame()` callbacks, `ResizeObserver` and\n * `IntersectionObserver` callbacks, and style/layout calculation) as well\n * as off-main-thread work (such as compositor, GPU, and raster work).\n */\n presentationDelay: number;\n /**\n * The loading state of the document at the time when the interaction\n * corresponding to INP occurred (see `LoadState` for details). If the\n * interaction occurred while the document was loading and executing script\n * (e.g. usually in the `dom-interactive` phase) it can result in long delays.\n */\n loadState: LoadState;\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eINPAttribution\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * A selector identifying the element that the user first interacted with\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * as part of the frame where the INP candidate interaction occurred.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * If this value is an empty string, that generally means the element was\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * removed from the DOM after the interaction.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003einteractionTarget\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003estring\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * A reference to the HTML element identified by `interactionTarget`.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * NOTE: for attribution purpose, a selector identifying the element is\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * typically more useful than the element itself. However, the element is\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * also made available in case additional context is needed.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003einteractionTargetElement\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003eNode\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eundefined\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The time when the user first interacted during the frame where the INP\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * candidate interaction occurred (if more than one interaction occurred\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * within the frame, only the first time is reported).\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003einteractionTime\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003eDOMHighResTimeStamp\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The best-guess timestamp of the next paint after the interaction.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * In general, this timestamp is the same as the `startTime + duration` of\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * the event timing entry. However, since `duration` values are rounded to\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * the nearest 8ms, it can sometimes appear that the paint occurred before\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * processing ended (which cannot happen). This value clamps the paint time\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * so it's always after `processingEnd` from the Event Timing API and\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * `renderStart` from the Long Animation Frame API (where available).\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * It also averages the duration values for all entries in the same\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * animation frame, which should be closer to the \"real\" value.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003enextPaintTime\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003eDOMHighResTimeStamp\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The type of interaction, based on the event type of the `event` entry\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * that corresponds to the interaction (i.e. the first `event` entry\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * containing an `interactionId` dispatched in a given animation frame).\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * For \"pointerdown\", \"pointerup\", or \"click\" events this will be \"pointer\",\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * and for \"keydown\" or \"keyup\" events this will be \"keyboard\".\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003einteractionType\u003c/span\u003e: \u003cspan class=\"pl-s\"\u003e'pointer'\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-s\"\u003e'keyboard'\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * An array of Event Timing entries that were processed within the same\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * animation frame as the INP candidate interaction.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eprocessedEventEntries\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003ePerformanceEventTiming\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * If the browser supports the Long Animation Frame API, this array will\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * include any `long-animation-frame` entries that intersect with the INP\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * candidate interaction's `startTime` and the `processingEnd` time of the\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * last event processed within that animation frame. If the browser does not\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * support the Long Animation Frame API or no `long-animation-frame` entries\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * are detect, this array will be empty.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003elongAnimationFrameEntries\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003ePerformanceLongAnimationFrameTiming\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The time from when the user interacted with the page until when the\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * browser was first able to start processing event listeners for that\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * interaction. This time captures the delay before event processing can\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * begin due to the main thread being busy with other work.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003einputDelay\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003enumber\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The time from when the first event listener started running in response to\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * the user interaction until when all event listener processing has finished.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eprocessingDuration\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003enumber\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The time from when the browser finished processing all event listeners for\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * the user interaction until the next frame is presented on the screen and\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * visible to the user. This time includes work on the main thread (such as\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * `requestAnimationFrame()` callbacks, `ResizeObserver` and\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * `IntersectionObserver` callbacks, and style/layout calculation) as well\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * as off-main-thread work (such as compositor, GPU, and raster work).\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003epresentationDelay\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003enumber\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The loading state of the document at the time when the interaction\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * corresponding to INP occurred (see `LoadState` for details). If the\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * interaction occurred while the document was loading and executing script\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * (e.g. usually in the `dom-interactive` phase) it can result in long delays.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eloadState\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003eLoadState\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ccode\u003eLCPAttribution\u003c/code\u003e\u003c/h4\u003e\u003ca id=\"user-content-lcpattribution\" class=\"anchor\" aria-label=\"Permalink: LCPAttribution\" href=\"#lcpattribution\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"interface LCPAttribution {\n /**\n * The element corresponding to the largest contentful paint for the page.\n */\n element?: string;\n /**\n * The URL (if applicable) of the LCP image resource. If the LCP element\n * is a text node, this value will not be set.\n */\n url?: string;\n /**\n * The time from when the user initiates loading the page until when the\n * browser receives the first byte of the response (a.k.a. TTFB). See\n * [Optimize LCP](https://web.dev/articles/optimize-lcp) for details.\n */\n timeToFirstByte: number;\n /**\n * The delta between TTFB and when the browser starts loading the LCP\n * resource (if there is one, otherwise 0). See [Optimize\n * LCP](https://web.dev/articles/optimize-lcp) for details.\n */\n resourceLoadDelay: number;\n /**\n * The total time it takes to load the LCP resource itself (if there is one,\n * otherwise 0). See [Optimize LCP](https://web.dev/articles/optimize-lcp) for\n * details.\n */\n resourceLoadDuration: number;\n /**\n * The delta between when the LCP resource finishes loading until the LCP\n * element is fully rendered. See [Optimize\n * LCP](https://web.dev/articles/optimize-lcp) for details.\n */\n elementRenderDelay: number;\n /**\n * The `navigation` entry of the current page, which is useful for diagnosing\n * general page load issues. This can be used to access `serverTiming` for example:\n * navigationEntry?.serverTiming\n */\n navigationEntry?: PerformanceNavigationTiming;\n /**\n * The `resource` entry for the LCP resource (if applicable), which is useful\n * for diagnosing resource load issues.\n */\n lcpResourceEntry?: PerformanceResourceTiming;\n /**\n * The `LargestContentfulPaint` entry corresponding to LCP.\n */\n lcpEntry?: LargestContentfulPaint;\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eLCPAttribution\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The element corresponding to the largest contentful paint for the page.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eelement\u003c/span\u003e?: \u003cspan class=\"pl-smi\"\u003estring\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The URL (if applicable) of the LCP image resource. If the LCP element\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * is a text node, this value will not be set.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eurl\u003c/span\u003e?: \u003cspan class=\"pl-smi\"\u003estring\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The time from when the user initiates loading the page until when the\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * browser receives the first byte of the response (a.k.a. TTFB). See\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * [Optimize LCP](https://web.dev/articles/optimize-lcp) for details.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003etimeToFirstByte\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003enumber\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The delta between TTFB and when the browser starts loading the LCP\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * resource (if there is one, otherwise 0). See [Optimize\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * LCP](https://web.dev/articles/optimize-lcp) for details.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eresourceLoadDelay\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003enumber\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The total time it takes to load the LCP resource itself (if there is one,\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * otherwise 0). See [Optimize LCP](https://web.dev/articles/optimize-lcp) for\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * details.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eresourceLoadDuration\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003enumber\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The delta between when the LCP resource finishes loading until the LCP\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * element is fully rendered. See [Optimize\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * LCP](https://web.dev/articles/optimize-lcp) for details.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003eelementRenderDelay\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003enumber\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The `navigation` entry of the current page, which is useful for diagnosing\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * general page load issues. This can be used to access `serverTiming` for example:\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * navigationEntry?.serverTiming\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003enavigationEntry\u003c/span\u003e?: \u003cspan class=\"pl-smi\"\u003ePerformanceNavigationTiming\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The `resource` entry for the LCP resource (if applicable), which is useful\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * for diagnosing resource load issues.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003elcpResourceEntry\u003c/span\u003e?: \u003cspan class=\"pl-smi\"\u003ePerformanceResourceTiming\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The `LargestContentfulPaint` entry corresponding to LCP.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003elcpEntry\u003c/span\u003e?: \u003cspan class=\"pl-smi\"\u003eLargestContentfulPaint\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ccode\u003eTTFBAttribution\u003c/code\u003e\u003c/h4\u003e\u003ca id=\"user-content-ttfbattribution\" class=\"anchor\" aria-label=\"Permalink: TTFBAttribution\" href=\"#ttfbattribution\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-ts notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"export interface TTFBAttribution {\n /**\n * The total time from when the user initiates loading the page to when the\n * page starts to handle the request. Large values here are typically due\n * to HTTP redirects, though other browser processing contributes to this\n * duration as well (so even without redirect it's generally not zero).\n */\n waitingDuration: number;\n /**\n * The total time spent checking the HTTP cache for a match. For navigations\n * handled via service worker, this duration usually includes service worker\n * start-up time as well as time processing `fetch` event listeners, with\n * some exceptions, see: https://github.com/w3c/navigation-timing/issues/199\n */\n cacheDuration: number;\n /**\n * The total time to resolve the DNS for the requested domain.\n */\n dnsDuration: number;\n /**\n * The total time to create the connection to the requested domain.\n */\n connectionDuration: number;\n /**\n * The total time from when the request was sent until the first byte of the\n * response was received. This includes network time as well as server\n * processing time.\n */\n requestDuration: number;\n /**\n * The `navigation` entry of the current page, which is useful for diagnosing\n * general page load issues. This can be used to access `serverTiming` for\n * example: navigationEntry?.serverTiming\n */\n navigationEntry?: PerformanceNavigationTiming;\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eexport\u003c/span\u003e \u003cspan class=\"pl-k\"\u003einterface\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003eTTFBAttribution\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The total time from when the user initiates loading the page to when the\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * page starts to handle the request. Large values here are typically due\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * to HTTP redirects, though other browser processing contributes to this\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * duration as well (so even without redirect it's generally not zero).\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003ewaitingDuration\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003enumber\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The total time spent checking the HTTP cache for a match. For navigations\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * handled via service worker, this duration usually includes service worker\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * start-up time as well as time processing `fetch` event listeners, with\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * some exceptions, see: https://github.com/w3c/navigation-timing/issues/199\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003ecacheDuration\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003enumber\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The total time to resolve the DNS for the requested domain.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003ednsDuration\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003enumber\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The total time to create the connection to the requested domain.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003econnectionDuration\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003enumber\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The total time from when the request was sent until the first byte of the\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * response was received. This includes network time as well as server\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * processing time.\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003erequestDuration\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003enumber\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e/**\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * The `navigation` entry of the current page, which is useful for diagnosing\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * general page load issues. This can be used to access `serverTiming` for\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e * example: navigationEntry?.serverTiming\u003c/span\u003e\n\u003cspan class=\"pl-c\"\u003e */\u003c/span\u003e\n \u003cspan class=\"pl-c1\"\u003enavigationEntry\u003c/span\u003e?: \u003cspan class=\"pl-smi\"\u003ePerformanceNavigationTiming\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBrowser Support\u003c/h2\u003e\u003ca id=\"user-content-browser-support\" class=\"anchor\" aria-label=\"Permalink: Browser Support\" href=\"#browser-support\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003eweb-vitals\u003c/code\u003e code has been tested and will run without error in all major browsers as well as Internet Explorer back to version 9. However, some of the APIs required to capture these metrics are currently only available in Chromium-based browsers (e.g. Chrome, Edge, Opera, Samsung Internet).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eBrowser support for each function is as follows:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003eonCLS()\u003c/code\u003e: Chromium\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eonFCP()\u003c/code\u003e: Chromium, Firefox, Safari\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eonFID()\u003c/code\u003e: Chromium, Firefox \u003cem\u003e(Deprecated)\u003c/em\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eonINP()\u003c/code\u003e: Chromium\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eonLCP()\u003c/code\u003e: Chromium, Firefox\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eonTTFB()\u003c/code\u003e: Chromium, Firefox, Safari\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLimitations\u003c/h2\u003e\u003ca id=\"user-content-limitations\" class=\"anchor\" aria-label=\"Permalink: Limitations\" href=\"#limitations\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003eweb-vitals\u003c/code\u003e library is primarily a wrapper around the Web APIs that measure the Web Vitals metrics, which means the limitations of those APIs will mostly apply to this library as well. More details on these limitations is available in \u003ca href=\"https://web.dev/articles/crux-and-rum-differences\" rel=\"nofollow\"\u003ethis blog post\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe primary limitation of these APIs is they have no visibility into \u003ccode\u003e\u0026lt;iframe\u0026gt;\u003c/code\u003e content (not even same-origin iframes), which means pages that make use of iframes will likely see a difference between the data measured by this library and the data available in the Chrome User Experience Report (which does include iframe content).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFor same-origin iframes, it's possible to use the \u003ccode\u003eweb-vitals\u003c/code\u003e library to measure metrics, but it's tricky because it requires the developer to add the library to every frame and \u003ccode\u003epostMessage()\u003c/code\u003e the results to the parent frame for aggregation.\u003c/p\u003e\n\u003cdiv class=\"markdown-alert markdown-alert-note\" dir=\"auto\"\u003e\u003cp class=\"markdown-alert-title\" dir=\"auto\"\u003e\u003csvg class=\"octicon octicon-info mr-2\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z\"\u003e\u003c/path\u003e\u003c/svg\u003eNote\u003c/p\u003e\u003cp dir=\"auto\"\u003eGiven the lack of iframe support, the \u003ccode\u003eonCLS()\u003c/code\u003e function technically measures \u003ca href=\"https://github.com/wicg/layout-instability#cumulative-scores\"\u003eDCLS\u003c/a\u003e (Document Cumulative Layout Shift) rather than CLS, if the page includes iframes).\u003c/p\u003e\n\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eDevelopment\u003c/h2\u003e\u003ca id=\"user-content-development\" class=\"anchor\" aria-label=\"Permalink: Development\" href=\"#development\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBuilding the code\u003c/h3\u003e\u003ca id=\"user-content-building-the-code\" class=\"anchor\" aria-label=\"Permalink: Building the code\" href=\"#building-the-code\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003eweb-vitals\u003c/code\u003e source code is written in TypeScript. To transpile the code and build the production bundles, run the following command.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"npm run build\"\u003e\u003cpre\u003enpm run build\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eTo build the code and watch for changes, run:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"npm run watch\"\u003e\u003cpre\u003enpm run watch\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eRunning the tests\u003c/h3\u003e\u003ca id=\"user-content-running-the-tests\" class=\"anchor\" aria-label=\"Permalink: Running the tests\" href=\"#running-the-tests\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003eweb-vitals\u003c/code\u003e code is tested in real browsers using \u003ca href=\"https://webdriver.io/\" rel=\"nofollow\"\u003ewebdriver.io\u003c/a\u003e. Use the following command to run the tests:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"npm test\"\u003e\u003cpre\u003enpm \u003cspan class=\"pl-c1\"\u003etest\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eTo test any of the APIs manually, you can start the test server\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"npm run test:server\"\u003e\u003cpre\u003enpm run test:server\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThen navigate to \u003ccode\u003ehttp://localhost:9090/test/\u0026lt;view\u0026gt;\u003c/code\u003e, where \u003ccode\u003e\u0026lt;view\u0026gt;\u003c/code\u003e is the basename of one the templates under \u003ca href=\"/GoogleChrome/web-vitals/blob/main/test/views\"\u003e/test/views/\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eYou'll likely want to combine this with \u003ccode\u003enpm run watch\u003c/code\u003e to ensure any changes you make are transpiled and rebuilt.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eIntegrations\u003c/h2\u003e\u003ca id=\"user-content-integrations\" class=\"anchor\" aria-label=\"Permalink: Integrations\" href=\"#integrations\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"https://goo.gle/web-vitals-connector\" rel=\"nofollow\"\u003e\u003cstrong\u003eWeb Vitals Connector\u003c/strong\u003e\u003c/a\u003e: Data Studio connector to create dashboards from \u003ca href=\"https://web.dev/articles/vitals-ga4\" rel=\"nofollow\"\u003eWeb Vitals data captured in BiqQuery\u003c/a\u003e.\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://www.simoahava.com/custom-templates/core-web-vitals/\" rel=\"nofollow\"\u003e\u003cstrong\u003eCore Web Vitals Custom Tag template\u003c/strong\u003e\u003c/a\u003e: Custom GTM template tag to \u003ca href=\"https://www.simoahava.com/analytics/track-core-web-vitals-in-ga4-with-google-tag-manager/\" rel=\"nofollow\"\u003eadd measurement handlers\u003c/a\u003e for all Core Web Vitals metrics.\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/treosh/web-vitals-reporter\"\u003e\u003cstrong\u003e\u003ccode\u003eweb-vitals-reporter\u003c/code\u003e\u003c/strong\u003e\u003c/a\u003e: JavaScript library to batch \u003ccode\u003ecallback\u003c/code\u003e functions and send data with a single request.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLicense\u003c/h2\u003e\u003ca id=\"user-content-license\" class=\"anchor\" aria-label=\"Permalink: License\" href=\"#license\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"/GoogleChrome/web-vitals/blob/main/LICENSE\"\u003eApache 2.0\u003c/a\u003e\u003c/p\u003e\n\u003c/article\u003e","loaded":true,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":[{"level":1,"text":"web-vitals","anchor":"web-vitals","htmlText":"web-vitals"},{"level":2,"text":"Overview","anchor":"overview","htmlText":"Overview"},{"level":3,"text":"Core Web Vitals","anchor":"core-web-vitals","htmlText":"Core Web Vitals"},{"level":3,"text":"Other metrics","anchor":"other-metrics","htmlText":"Other metrics"},{"level":2,"text":"Install and load the library","anchor":"install-and-load-the-library","htmlText":"Install and load the library"},{"level":3,"text":"From npm","anchor":"from-npm","htmlText":"From npm"},{"level":3,"text":"From a CDN","anchor":"from-a-cdn","htmlText":"From a CDN"},{"level":2,"text":"Usage","anchor":"usage","htmlText":"Usage"},{"level":3,"text":"Basic usage","anchor":"basic-usage","htmlText":"Basic usage"},{"level":3,"text":"Report the value on every change","anchor":"report-the-value-on-every-change","htmlText":"Report the value on every change"},{"level":3,"text":"Report only the delta of changes","anchor":"report-only-the-delta-of-changes","htmlText":"Report only the delta of changes"},{"level":3,"text":"Send the results to an analytics endpoint","anchor":"send-the-results-to-an-analytics-endpoint","htmlText":"Send the results to an analytics endpoint"},{"level":3,"text":"Send the results to Google Analytics","anchor":"send-the-results-to-google-analytics","htmlText":"Send the results to Google Analytics"},{"level":3,"text":"Send the results to Google Tag Manager","anchor":"send-the-results-to-google-tag-manager","htmlText":"Send the results to Google Tag Manager"},{"level":3,"text":"Send attribution data","anchor":"send-attribution-data","htmlText":"Send attribution data"},{"level":3,"text":"Batch multiple reports together","anchor":"batch-multiple-reports-together","htmlText":"Batch multiple reports together"},{"level":2,"text":"Build options","anchor":"build-options","htmlText":"Build options"},{"level":3,"text":"Which build is right for you?","anchor":"which-build-is-right-for-you","htmlText":"Which build is right for you?"},{"level":2,"text":"API","anchor":"api","htmlText":"API"},{"level":3,"text":"Types:","anchor":"types","htmlText":"Types:"},{"level":4,"text":"Metric","anchor":"metric","htmlText":"Metric"},{"level":5,"text":"CLSMetric","anchor":"clsmetric","htmlText":"CLSMetric"},{"level":5,"text":"FCPMetric","anchor":"fcpmetric","htmlText":"FCPMetric"},{"level":5,"text":"FIDMetric","anchor":"fidmetric","htmlText":"FIDMetric"},{"level":5,"text":"INPMetric","anchor":"inpmetric","htmlText":"INPMetric"},{"level":5,"text":"LCPMetric","anchor":"lcpmetric","htmlText":"LCPMetric"},{"level":5,"text":"TTFBMetric","anchor":"ttfbmetric","htmlText":"TTFBMetric"},{"level":4,"text":"MetricRatingThresholds","anchor":"metricratingthresholds","htmlText":"MetricRatingThresholds"},{"level":4,"text":"ReportOpts","anchor":"reportopts","htmlText":"ReportOpts"},{"level":4,"text":"LoadState","anchor":"loadstate","htmlText":"LoadState"},{"level":3,"text":"Functions:","anchor":"functions","htmlText":"Functions:"},{"level":4,"text":"onCLS()","anchor":"oncls","htmlText":"onCLS()"},{"level":4,"text":"onFCP()","anchor":"onfcp","htmlText":"onFCP()"},{"level":4,"text":"onFID()","anchor":"onfid","htmlText":"onFID()"},{"level":4,"text":"onINP()","anchor":"oninp","htmlText":"onINP()"},{"level":4,"text":"onLCP()","anchor":"onlcp","htmlText":"onLCP()"},{"level":4,"text":"onTTFB()","anchor":"onttfb","htmlText":"onTTFB()"},{"level":3,"text":"Rating Thresholds:","anchor":"rating-thresholds","htmlText":"Rating Thresholds:"},{"level":3,"text":"Attribution:","anchor":"attribution","htmlText":"Attribution:"},{"level":4,"text":"CLSAttribution","anchor":"clsattribution","htmlText":"CLSAttribution"},{"level":4,"text":"FCPAttribution","anchor":"fcpattribution","htmlText":"FCPAttribution"},{"level":4,"text":"FIDAttribution","anchor":"fidattribution","htmlText":"FIDAttribution"},{"level":4,"text":"INPAttribution","anchor":"inpattribution","htmlText":"INPAttribution"},{"level":4,"text":"LCPAttribution","anchor":"lcpattribution","htmlText":"LCPAttribution"},{"level":4,"text":"TTFBAttribution","anchor":"ttfbattribution","htmlText":"TTFBAttribution"},{"level":2,"text":"Browser Support","anchor":"browser-support","htmlText":"Browser Support"},{"level":2,"text":"Limitations","anchor":"limitations","htmlText":"Limitations"},{"level":2,"text":"Development","anchor":"development","htmlText":"Development"},{"level":3,"text":"Building the code","anchor":"building-the-code","htmlText":"Building the code"},{"level":3,"text":"Running the tests","anchor":"running-the-tests","htmlText":"Running the tests"},{"level":2,"text":"Integrations","anchor":"integrations","htmlText":"Integrations"},{"level":2,"text":"License","anchor":"license","htmlText":"License"}],"siteNavLoginPath":"/login?return_to=https%3A%2F%2Fgithub.com%2FGoogleChrome%2Fweb-vitals"}},{"displayName":"CODE_OF_CONDUCT.md","repoName":"web-vitals","refName":"main","path":"CODE_OF_CONDUCT.md","preferredFileType":"code_of_conduct","tabName":"Code of 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class="types__StyledButton-sc-ws60qy-0 dPmZyJ d-none d-lg-flex LinkButton-module__code-view-link-button--xvCGA flex-items-center fgColor-default" data-loading="false" data-size="small" aria-describedby=":Raqj8pab:-loading-announcement"><span data-component="buttonContent" class="Box-sc-g0xbh4-0 gUkoLg"><span data-component="leadingVisual" class="Box-sc-g0xbh4-0 hzSPyu"><svg aria-hidden="true" focusable="false" class="octicon octicon-history" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" style="display:inline-block;user-select:none;vertical-align:text-bottom;overflow:visible"><path d="m.427 1.927 1.215 1.215a8.002 8.002 0 1 1-1.6 5.685.75.75 0 1 1 1.493-.154 6.5 6.5 0 1 0 1.18-4.458l1.358 1.358A.25.25 0 0 1 3.896 6H.25A.25.25 0 0 1 0 5.75V2.104a.25.25 0 0 1 .427-.177ZM7.75 4a.75.75 0 0 1 .75.75v2.992l2.028.812a.75.75 0 0 1-.557 1.392l-2.5-1A.751.751 0 0 1 7 8.25v-3.5A.75.75 0 0 1 7.75 4Z"></path></svg></span><span data-component="text"><span class="fgColor-default">441 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class="types__StyledButton-sc-ws60qy-0 gXPTqA" data-loading="false" data-size="medium" aria-describedby=":Rr9ab:-loading-announcement" id=":Rr9ab:"><svg aria-hidden="true" focusable="false" class="octicon octicon-list-unordered" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" style="display:inline-block;user-select:none;vertical-align:text-bottom;overflow:visible"><path d="M5.75 2.5h8.5a.75.75 0 0 1 0 1.5h-8.5a.75.75 0 0 1 0-1.5Zm0 5h8.5a.75.75 0 0 1 0 1.5h-8.5a.75.75 0 0 1 0-1.5Zm0 5h8.5a.75.75 0 0 1 0 1.5h-8.5a.75.75 0 0 1 0-1.5ZM2 14a1 1 0 1 1 0-2 1 1 0 0 1 0 2Zm1-6a1 1 0 1 1-2 0 1 1 0 0 1 2 0ZM2 4a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg></button></div><div class="Box-sc-g0xbh4-0 QkQOb js-snippet-clipboard-copy-unpositioned" data-hpc="true"><article class="markdown-body entry-content container-lg" itemprop="text"><div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto"><code>web-vitals</code></h1><a id="user-content-web-vitals" class="anchor" aria-label="Permalink: web-vitals" href="#web-vitals"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li><a href="#overview">Overview</a></li> <li><a href="#installation">Install and load the library</a> <ul dir="auto"> <li><a href="#import-web-vitals-from-npm">From npm</a></li> <li><a href="#load-web-vitals-from-a-cdn">From a CDN</a></li> </ul> </li> <li><a href="#usage">Usage</a> <ul dir="auto"> <li><a href="#basic-usage">Basic usage</a></li> <li><a href="#report-the-value-on-every-change">Report the value on every change</a></li> <li><a href="#report-only-the-delta-of-changes">Report only the delta of changes</a></li> <li><a href="#send-the-results-to-an-analytics-endpoint">Send the results to an analytics endpoint</a></li> <li><a href="#send-the-results-to-google-analytics">Send the results to Google Analytics</a></li> <li><a href="#send-the-results-to-google-tag-manager">Send the results to Google Tag Manager</a></li> <li><a href="#send-attribution-data">Send attribution data</a></li> <li><a href="#batch-multiple-reports-together">Batch multiple reports together</a></li> </ul> </li> <li><a href="#build-options">Build options</a> <ul dir="auto"> <li><a href="#which-build-is-right-for-you">Which build is right for you?</a></li> </ul> </li> <li><a href="#api">API</a> <ul dir="auto"> <li><a href="#types">Types</a></li> <li><a href="#functions">Functions</a></li> <li><a href="#rating-thresholds">Rating Thresholds</a></li> <li><a href="#attribution">Attribution</a></li> </ul> </li> <li><a href="#browser-support">Browser Support</a></li> <li><a href="#limitations">Limitations</a></li> <li><a href="#development">Development</a></li> <li><a href="#integrations">Integrations</a></li> <li><a href="#license">License</a></li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Overview</h2><a id="user-content-overview" class="anchor" aria-label="Permalink: Overview" href="#overview"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The <code>web-vitals</code> library is a tiny (~2K, brotli'd), modular library for measuring all the <a href="https://web.dev/articles/vitals" rel="nofollow">Web Vitals</a> metrics on real users, in a way that accurately matches how they're measured by Chrome and reported to other Google tools (e.g. <a href="https://developers.google.com/web/tools/chrome-user-experience-report" rel="nofollow">Chrome User Experience Report</a>, <a href="https://developers.google.com/speed/pagespeed/insights/" rel="nofollow">Page Speed Insights</a>, <a href="https://webmasters.googleblog.com/2019/11/search-console-speed-report.html" rel="nofollow">Search Console's Speed Report</a>).</p> <p dir="auto">The library supports all of the <a href="https://web.dev/articles/vitals#core_web_vitals" rel="nofollow">Core Web Vitals</a> as well as a number of other metrics that are useful in diagnosing <a href="https://web.dev/articles/user-centric-performance-metrics" rel="nofollow">real-user</a> performance issues.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Core Web Vitals</h3><a id="user-content-core-web-vitals" class="anchor" aria-label="Permalink: Core Web Vitals" href="#core-web-vitals"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li><a href="https://web.dev/articles/cls" rel="nofollow">Cumulative Layout Shift (CLS)</a></li> <li><a href="https://web.dev/articles/inp" rel="nofollow">Interaction to Next Paint (INP)</a></li> <li><a href="https://web.dev/articles/lcp" rel="nofollow">Largest Contentful Paint (LCP)</a></li> </ul> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Other metrics</h3><a id="user-content-other-metrics" class="anchor" aria-label="Permalink: Other metrics" href="#other-metrics"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li><a href="https://web.dev/articles/fcp" rel="nofollow">First Contentful Paint (FCP)</a></li> <li><a href="https://web.dev/articles/ttfb" rel="nofollow">Time to First Byte (TTFB)</a></li> <li><a href="https://web.dev/articles/fid" rel="nofollow">First Input Delay (FID)</a></li> </ul> <div class="markdown-alert markdown-alert-caution" dir="auto"><p class="markdown-alert-title" dir="auto"><svg class="octicon octicon-stop mr-2" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M4.47.22A.749.749 0 0 1 5 0h6c.199 0 .389.079.53.22l4.25 4.25c.141.14.22.331.22.53v6a.749.749 0 0 1-.22.53l-4.25 4.25A.749.749 0 0 1 11 16H5a.749.749 0 0 1-.53-.22L.22 11.53A.749.749 0 0 1 0 11V5c0-.199.079-.389.22-.53Zm.84 1.28L1.5 5.31v5.38l3.81 3.81h5.38l3.81-3.81V5.31L10.69 1.5ZM8 4a.75.75 0 0 1 .75.75v3.5a.75.75 0 0 1-1.5 0v-3.5A.75.75 0 0 1 8 4Zm0 8a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg>Caution</p><p dir="auto">FID is deprecated and will be removed in the next major release.</p> </div> <p dir="auto"><a name="user-content-installation"></a> <a name="user-content-load-the-library"></a></p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Install and load the library</h2><a id="user-content-install-and-load-the-library" class="anchor" aria-label="Permalink: Install and load the library" href="#install-and-load-the-library"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><a name="user-content-import-web-vitals-from-npm"></a></p> <p dir="auto">The <code>web-vitals</code> library uses the <code>buffered</code> flag for <a href="https://developer.mozilla.org/docs/Web/API/PerformanceObserver/observe" rel="nofollow">PerformanceObserver</a>, allowing it to access performance entries that occurred before the library was loaded.</p> <p dir="auto">This means you do not need to load this library early in order to get accurate performance data. In general, this library should be deferred until after other user-impacting code has loaded.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">From npm</h3><a id="user-content-from-npm" class="anchor" aria-label="Permalink: From npm" href="#from-npm"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">You can install this library from npm by running:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="npm install web-vitals"><pre>npm install web-vitals</pre></div> <div class="markdown-alert markdown-alert-note" dir="auto"><p class="markdown-alert-title" dir="auto"><svg class="octicon octicon-info mr-2" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg>Note</p><p dir="auto">If you're not using npm, you can still load <code>web-vitals</code> via <code><script></code> tags from a CDN like <a href="https://unpkg.com" rel="nofollow">unpkg.com</a>. See the <a href="#load-web-vitals-from-a-cdn">load <code>web-vitals</code> from a CDN</a> usage example below for details.</p> </div> <p dir="auto">There are a few different builds of the <code>web-vitals</code> library, and how you load the library depends on which build you want to use.</p> <p dir="auto">For details on the difference between the builds, see <a href="#which-build-is-right-for-you">which build is right for you</a>.</p> <p dir="auto"><strong>1. The "standard" build</strong></p> <p dir="auto">To load the "standard" build, import modules from the <code>web-vitals</code> package in your application code (as you would with any npm package and node-based build tool):</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import {onLCP, onINP, onCLS} from 'web-vitals'; onCLS(console.log); onINP(console.log); onLCP(console.log);"><pre><span class="pl-k">import</span> <span class="pl-kos">{</span><span class="pl-s1">onLCP</span><span class="pl-kos">,</span> <span class="pl-s1">onINP</span><span class="pl-kos">,</span> <span class="pl-s1">onCLS</span><span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'web-vitals'</span><span class="pl-kos">;</span> <span class="pl-en">onCLS</span><span class="pl-kos">(</span><span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-c1">log</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-en">onINP</span><span class="pl-kos">(</span><span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-c1">log</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-en">onLCP</span><span class="pl-kos">(</span><span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-c1">log</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <div class="markdown-alert markdown-alert-note" dir="auto"><p class="markdown-alert-title" dir="auto"><svg class="octicon octicon-info mr-2" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg>Note</p><p dir="auto">In version 2, these functions were named <code>getXXX()</code> rather than <code>onXXX()</code>. They've <a href="https://github.com/GoogleChrome/web-vitals/pull/222" data-hovercard-type="pull_request" data-hovercard-url="/GoogleChrome/web-vitals/pull/222/hovercard">been renamed</a> in version 3 to reduce confusion (see <a href="https://github.com/GoogleChrome/web-vitals/pull/217" data-hovercard-type="issue" data-hovercard-url="/GoogleChrome/web-vitals/issues/217/hovercard">#217</a> for details) and will continue to be available using the <code>getXXX()</code> until at least version 4. Users are encouraged to switch to the new names, though, for future compatibility.</p> </div> <p dir="auto"><a name="user-content-attribution-build"></a></p> <p dir="auto"><strong>2. The "attribution" build</strong></p> <p dir="auto">Measuring the Web Vitals scores for your real users is a great first step toward optimizing the user experience. But if your scores aren't <em>good</em>, the next step is to understand why they're not good and work to improve them.</p> <p dir="auto">The "attribution" build helps you do that by including additional diagnostic information with each metric to help you identify the root cause of poor performance as well as prioritize the most important things to fix.</p> <p dir="auto">The "attribution" build is slightly larger than the "standard" build (by about 600 bytes, brotli'd), so while the code size is still small, it's only recommended if you're actually using these features.</p> <p dir="auto">To load the "attribution" build, change any <code>import</code> statements that reference <code>web-vitals</code> to <code>web-vitals/attribution</code>:</p> <div class="highlight highlight-source-diff notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="- import {onLCP, onINP, onCLS} from 'web-vitals'; + import {onLCP, onINP, onCLS} from 'web-vitals/attribution';"><pre><span class="pl-md"><span class="pl-md">-</span> import {onLCP, onINP, onCLS} from 'web-vitals';</span> <span class="pl-mi1"><span class="pl-mi1">+</span> import {onLCP, onINP, onCLS} from 'web-vitals/attribution';</span></pre></div> <p dir="auto">Usage for each of the imported function is identical to the standard build, but when importing from the attribution build, the <a href="#metric">metric</a> objects will contain an additional <a href="#attribution"><code>attribution</code></a> property.</p> <p dir="auto">See <a href="#send-attribution-data">Send attribution data</a> for usage examples, and the <a href="#attribution"><code>attribution</code> reference</a> for details on what values are added for each metric.</p> <p dir="auto"><a name="user-content-load-web-vitals-from-a-cdn"></a></p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">From a CDN</h3><a id="user-content-from-a-cdn" class="anchor" aria-label="Permalink: From a CDN" href="#from-a-cdn"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The recommended way to use the <code>web-vitals</code> package is to install it from npm and integrate it into your build process. However, if you're not using npm, it's still possible to use <code>web-vitals</code> by requesting it from a CDN that serves npm package files.</p> <p dir="auto">The following examples show how to load <code>web-vitals</code> from <a href="https://unpkg.com/browse/web-vitals/" rel="nofollow">unpkg.com</a>. It is also possible to load this from <a href="https://www.jsdelivr.com/package/npm/web-vitals" rel="nofollow">jsDelivr</a>, and <a href="https://cdnjs.com/libraries/web-vitals" rel="nofollow">cdnjs</a>.</p> <p dir="auto"><em><strong>Important!</strong> The <a href="https://unpkg.com" rel="nofollow">unpkg.com</a>, <a href="https://www.jsdelivr.com/" rel="nofollow">jsDelivr</a>, and <a href="https://cdnjs.com" rel="nofollow">cdnjs</a> CDNs are shown here for example purposes only. <code>unpkg.com</code>, <code>jsDelivr</code>, and <code>cdnjs</code> are not affiliated with Google, and there are no guarantees that loading the library from those CDNs will continue to work in the future. Self-hosting the built files rather than loading from the CDN is better for security, reliability, and performance reasons.</em></p> <p dir="auto"><strong>Load the "standard" build</strong> <em>(using a module script)</em></p> <div class="highlight highlight-text-html-basic notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="<!-- Append the `?module` param to load the module version of `web-vitals` --> <script type="module"> import {onCLS, onINP, onLCP} from 'https://unpkg.com/web-vitals@4?module'; onCLS(console.log); onINP(console.log); onLCP(console.log); </script>"><pre><span class="pl-c"><!-- Append the `?module` param to load the module version of `web-vitals` --></span> <span class="pl-kos"><</span><span class="pl-ent">script</span> <span class="pl-c1">type</span>="<span class="pl-s">module</span>"<span class="pl-kos">></span> <span class="pl-k">import</span> <span class="pl-kos">{</span><span class="pl-s1">onCLS</span><span class="pl-kos">,</span> <span class="pl-s1">onINP</span><span class="pl-kos">,</span> <span class="pl-s1">onLCP</span><span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'https://unpkg.com/web-vitals@4?module'</span><span class="pl-kos">;</span> <span class="pl-en">onCLS</span><span class="pl-kos">(</span><span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-c1">log</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-en">onINP</span><span class="pl-kos">(</span><span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-c1">log</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-en">onLCP</span><span class="pl-kos">(</span><span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-c1">log</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos"></</span><span class="pl-ent">script</span><span class="pl-kos">></span></pre></div> <p dir="auto"><strong>Load the "standard" build</strong> <em>(using a classic script)</em></p> <div class="highlight highlight-text-html-basic notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="<script> (function () { var script = document.createElement('script'); script.src = 'https://unpkg.com/web-vitals@4/dist/web-vitals.iife.js'; script.onload = function () { // When loading `web-vitals` using a classic script, all the public // methods can be found on the `webVitals` global namespace. webVitals.onCLS(console.log); webVitals.onINP(console.log); webVitals.onLCP(console.log); }; document.head.appendChild(script); })(); </script>"><pre><span class="pl-kos"><</span><span class="pl-ent">script</span><span class="pl-kos">></span> <span class="pl-kos">(</span><span class="pl-k">function</span> <span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-k">var</span> <span class="pl-s1">script</span> <span class="pl-c1">=</span> <span class="pl-smi">document</span><span class="pl-kos">.</span><span class="pl-en">createElement</span><span class="pl-kos">(</span><span class="pl-s">'script'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">script</span><span class="pl-kos">.</span><span class="pl-c1">src</span> <span class="pl-c1">=</span> <span class="pl-s">'https://unpkg.com/web-vitals@4/dist/web-vitals.iife.js'</span><span class="pl-kos">;</span> <span class="pl-s1">script</span><span class="pl-kos">.</span><span class="pl-en">onload</span> <span class="pl-c1">=</span> <span class="pl-k">function</span> <span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-c">// When loading `web-vitals` using a classic script, all the public</span> <span class="pl-c">// methods can be found on the `webVitals` global namespace.</span> <span class="pl-s1">webVitals</span><span class="pl-kos">.</span><span class="pl-en">onCLS</span><span class="pl-kos">(</span><span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-c1">log</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">webVitals</span><span class="pl-kos">.</span><span class="pl-en">onINP</span><span class="pl-kos">(</span><span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-c1">log</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">webVitals</span><span class="pl-kos">.</span><span class="pl-en">onLCP</span><span class="pl-kos">(</span><span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-c1">log</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span><span class="pl-kos">;</span> <span class="pl-smi">document</span><span class="pl-kos">.</span><span class="pl-c1">head</span><span class="pl-kos">.</span><span class="pl-en">appendChild</span><span class="pl-kos">(</span><span class="pl-s1">script</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos"></</span><span class="pl-ent">script</span><span class="pl-kos">></span></pre></div> <p dir="auto"><strong>Load the "attribution" build</strong> <em>(using a module script)</em></p> <div class="highlight highlight-text-html-basic notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="<!-- Append the `?module` param to load the module version of `web-vitals` --> <script type="module"> import { onCLS, onINP, onLCP, } from 'https://unpkg.com/web-vitals@4/dist/web-vitals.attribution.js?module'; onCLS(console.log); onINP(console.log); onLCP(console.log); </script>"><pre><span class="pl-c"><!-- Append the `?module` param to load the module version of `web-vitals` --></span> <span class="pl-kos"><</span><span class="pl-ent">script</span> <span class="pl-c1">type</span>="<span class="pl-s">module</span>"<span class="pl-kos">></span> <span class="pl-k">import</span> <span class="pl-kos">{</span> <span class="pl-s1">onCLS</span><span class="pl-kos">,</span> <span class="pl-s1">onINP</span><span class="pl-kos">,</span> <span class="pl-s1">onLCP</span><span class="pl-kos">,</span> <span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'https://unpkg.com/web-vitals@4/dist/web-vitals.attribution.js?module'</span><span class="pl-kos">;</span> <span class="pl-en">onCLS</span><span class="pl-kos">(</span><span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-c1">log</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-en">onINP</span><span class="pl-kos">(</span><span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-c1">log</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-en">onLCP</span><span class="pl-kos">(</span><span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-c1">log</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos"></</span><span class="pl-ent">script</span><span class="pl-kos">></span></pre></div> <p dir="auto"><strong>Load the "attribution" build</strong> <em>(using a classic script)</em></p> <div class="highlight highlight-text-html-basic notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="<script> (function () { var script = document.createElement('script'); script.src = 'https://unpkg.com/web-vitals@4/dist/web-vitals.attribution.iife.js'; script.onload = function () { // When loading `web-vitals` using a classic script, all the public // methods can be found on the `webVitals` global namespace. webVitals.onCLS(console.log); webVitals.onINP(console.log); webVitals.onLCP(console.log); }; document.head.appendChild(script); })(); </script>"><pre><span class="pl-kos"><</span><span class="pl-ent">script</span><span class="pl-kos">></span> <span class="pl-kos">(</span><span class="pl-k">function</span> <span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-k">var</span> <span class="pl-s1">script</span> <span class="pl-c1">=</span> <span class="pl-smi">document</span><span class="pl-kos">.</span><span class="pl-en">createElement</span><span class="pl-kos">(</span><span class="pl-s">'script'</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">script</span><span class="pl-kos">.</span><span class="pl-c1">src</span> <span class="pl-c1">=</span> <span class="pl-s">'https://unpkg.com/web-vitals@4/dist/web-vitals.attribution.iife.js'</span><span class="pl-kos">;</span> <span class="pl-s1">script</span><span class="pl-kos">.</span><span class="pl-en">onload</span> <span class="pl-c1">=</span> <span class="pl-k">function</span> <span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-c">// When loading `web-vitals` using a classic script, all the public</span> <span class="pl-c">// methods can be found on the `webVitals` global namespace.</span> <span class="pl-s1">webVitals</span><span class="pl-kos">.</span><span class="pl-en">onCLS</span><span class="pl-kos">(</span><span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-c1">log</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">webVitals</span><span class="pl-kos">.</span><span class="pl-en">onINP</span><span class="pl-kos">(</span><span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-c1">log</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">webVitals</span><span class="pl-kos">.</span><span class="pl-en">onLCP</span><span class="pl-kos">(</span><span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-c1">log</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span><span class="pl-kos">;</span> <span class="pl-smi">document</span><span class="pl-kos">.</span><span class="pl-c1">head</span><span class="pl-kos">.</span><span class="pl-en">appendChild</span><span class="pl-kos">(</span><span class="pl-s1">script</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos"></</span><span class="pl-ent">script</span><span class="pl-kos">></span></pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Usage</h2><a id="user-content-usage" class="anchor" aria-label="Permalink: Usage" href="#usage"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Basic usage</h3><a id="user-content-basic-usage" class="anchor" aria-label="Permalink: Basic usage" href="#basic-usage"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Each of the Web Vitals metrics is exposed as a single function that takes a <code>callback</code> function that will be called any time the metric value is available and ready to be reported.</p> <p dir="auto">The following example measures each of the Core Web Vitals metrics and logs the result to the console once its value is ready to report.</p> <p dir="auto"><em>(The examples below import the "standard" build, but they will work with the "attribution" build as well.)</em></p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import {onCLS, onINP, onLCP} from 'web-vitals'; onCLS(console.log); onINP(console.log); onLCP(console.log);"><pre><span class="pl-k">import</span> <span class="pl-kos">{</span><span class="pl-s1">onCLS</span><span class="pl-kos">,</span> <span class="pl-s1">onINP</span><span class="pl-kos">,</span> <span class="pl-s1">onLCP</span><span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'web-vitals'</span><span class="pl-kos">;</span> <span class="pl-en">onCLS</span><span class="pl-kos">(</span><span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-c1">log</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-en">onINP</span><span class="pl-kos">(</span><span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-c1">log</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-en">onLCP</span><span class="pl-kos">(</span><span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-c1">log</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <p dir="auto">Note that some of these metrics will not report until the user has interacted with the page, switched tabs, or the page starts to unload. If you don't see the values logged to the console immediately, try reloading the page (with <a href="https://developer.chrome.com/docs/devtools/console/reference/#persist" rel="nofollow">preserve log</a> enabled) or switching tabs and then switching back.</p> <p dir="auto">Also, in some cases a metric callback may never be called:</p> <ul dir="auto"> <li>FID and INP are not reported if the user never interacts with the page.</li> <li>CLS, FCP, FID, and LCP are not reported if the page was loaded in the background.</li> </ul> <p dir="auto">In other cases, a metric callback may be called more than once:</p> <ul dir="auto"> <li>CLS and INP should be reported any time the <a href="https://developer.chrome.com/blog/page-lifecycle-api/#advice-hidden" rel="nofollow">page's <code>visibilityState</code> changes to hidden</a>.</li> <li>All metrics are reported again (with the above exceptions) after a page is restored from the <a href="https://web.dev/articles/bfcache" rel="nofollow">back/forward cache</a>.</li> </ul> <div class="markdown-alert markdown-alert-warning" dir="auto"><p class="markdown-alert-title" dir="auto"><svg class="octicon octicon-alert mr-2" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M6.457 1.047c.659-1.234 2.427-1.234 3.086 0l6.082 11.378A1.75 1.75 0 0 1 14.082 15H1.918a1.75 1.75 0 0 1-1.543-2.575Zm1.763.707a.25.25 0 0 0-.44 0L1.698 13.132a.25.25 0 0 0 .22.368h12.164a.25.25 0 0 0 .22-.368Zm.53 3.996v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 11a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path></svg>Warning</p><p dir="auto">Do not call any of the Web Vitals functions (e.g. <code>onCLS()</code>, <code>onINP()</code>, <code>onLCP()</code>) more than once per page load. Each of these functions creates a <code>PerformanceObserver</code> instance and registers event listeners for the lifetime of the page. While the overhead of calling these functions once is negligible, calling them repeatedly on the same page may eventually result in a memory leak.</p> </div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Report the value on every change</h3><a id="user-content-report-the-value-on-every-change" class="anchor" aria-label="Permalink: Report the value on every change" href="#report-the-value-on-every-change"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">In most cases, you only want the <code>callback</code> function to be called when the metric is ready to be reported. However, it is possible to report every change (e.g. each larger layout shift as it happens) by setting <code>reportAllChanges</code> to <code>true</code> in the optional, <a href="#reportopts">configuration object</a> (second parameter).</p> <div class="markdown-alert markdown-alert-important" dir="auto"><p class="markdown-alert-title" dir="auto"><svg class="octicon octicon-report mr-2" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M0 1.75C0 .784.784 0 1.75 0h12.5C15.216 0 16 .784 16 1.75v9.5A1.75 1.75 0 0 1 14.25 13H8.06l-2.573 2.573A1.458 1.458 0 0 1 3 14.543V13H1.75A1.75 1.75 0 0 1 0 11.25Zm1.75-.25a.25.25 0 0 0-.25.25v9.5c0 .138.112.25.25.25h2a.75.75 0 0 1 .75.75v2.19l2.72-2.72a.749.749 0 0 1 .53-.22h6.5a.25.25 0 0 0 .25-.25v-9.5a.25.25 0 0 0-.25-.25Zm7 2.25v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 9a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path></svg>Important</p><p dir="auto"><code>reportAllChanges</code> only reports when the <strong>metric changes</strong>, not for each <strong>input to the metric</strong>. For example, a new layout shift that does not increase the CLS metric will not be reported even with <code>reportAllChanges</code> set to <code>true</code> because the CLS metric has not changed. Similarly, for INP, each interaction is not reported even with <code>reportAllChanges</code> set to <code>true</code>—just when an interaction causes an increase to INP.</p> </div> <p dir="auto">This can be useful when debugging, but in general using <code>reportAllChanges</code> is not needed (or recommended) for measuring these metrics in production.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import {onCLS} from 'web-vitals'; // Logs CLS as the value changes. onCLS(console.log, {reportAllChanges: true});"><pre><span class="pl-k">import</span> <span class="pl-kos">{</span><span class="pl-s1">onCLS</span><span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'web-vitals'</span><span class="pl-kos">;</span> <span class="pl-c">// Logs CLS as the value changes.</span> <span class="pl-en">onCLS</span><span class="pl-kos">(</span><span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-c1">log</span><span class="pl-kos">,</span> <span class="pl-kos">{</span><span class="pl-c1">reportAllChanges</span>: <span class="pl-c1">true</span><span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Report only the delta of changes</h3><a id="user-content-report-only-the-delta-of-changes" class="anchor" aria-label="Permalink: Report only the delta of changes" href="#report-only-the-delta-of-changes"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Some analytics providers allow you to update the value of a metric, even after you've already sent it to their servers (overwriting the previously-sent value with the same <code>id</code>).</p> <p dir="auto">Other analytics providers, however, do not allow this, so instead of reporting the new value, you need to report only the delta (the difference between the current value and the last-reported value). You can then compute the total value by summing all metric deltas sent with the same ID.</p> <p dir="auto">The following example shows how to use the <code>id</code> and <code>delta</code> properties:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import {onCLS, onINP, onLCP} from 'web-vitals'; function logDelta({name, id, delta}) { console.log(`${name} matching ID ${id} changed by ${delta}`); } onCLS(logDelta); onINP(logDelta); onLCP(logDelta);"><pre><span class="pl-k">import</span> <span class="pl-kos">{</span><span class="pl-s1">onCLS</span><span class="pl-kos">,</span> <span class="pl-s1">onINP</span><span class="pl-kos">,</span> <span class="pl-s1">onLCP</span><span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'web-vitals'</span><span class="pl-kos">;</span> <span class="pl-k">function</span> <span class="pl-en">logDelta</span><span class="pl-kos">(</span><span class="pl-kos">{</span>name<span class="pl-kos">,</span> id<span class="pl-kos">,</span> delta<span class="pl-kos">}</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-s">`<span class="pl-s1"><span class="pl-kos">${</span><span class="pl-s1">name</span><span class="pl-kos">}</span></span> matching ID <span class="pl-s1"><span class="pl-kos">${</span><span class="pl-s1">id</span><span class="pl-kos">}</span></span> changed by <span class="pl-s1"><span class="pl-kos">${</span><span class="pl-s1">delta</span><span class="pl-kos">}</span></span>`</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-en">onCLS</span><span class="pl-kos">(</span><span class="pl-s1">logDelta</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-en">onINP</span><span class="pl-kos">(</span><span class="pl-s1">logDelta</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-en">onLCP</span><span class="pl-kos">(</span><span class="pl-s1">logDelta</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <div class="markdown-alert markdown-alert-note" dir="auto"><p class="markdown-alert-title" dir="auto"><svg class="octicon octicon-info mr-2" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg>Note</p><p dir="auto">The first time the <code>callback</code> function is called, its <code>value</code> and <code>delta</code> properties will be the same.</p> </div> <p dir="auto">In addition to using the <code>id</code> field to group multiple deltas for the same metric, it can also be used to differentiate different metrics reported on the same page. For example, after a back/forward cache restore, a new metric object is created with a new <code>id</code> (since back/forward cache restores are considered separate page visits).</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Send the results to an analytics endpoint</h3><a id="user-content-send-the-results-to-an-analytics-endpoint" class="anchor" aria-label="Permalink: Send the results to an analytics endpoint" href="#send-the-results-to-an-analytics-endpoint"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The following example measures each of the Core Web Vitals metrics and reports them to a hypothetical <code>/analytics</code> endpoint, as soon as each is ready to be sent.</p> <p dir="auto">The <code>sendToAnalytics()</code> function uses the <a href="https://developer.mozilla.org/docs/Web/API/Navigator/sendBeacon" rel="nofollow"><code>navigator.sendBeacon()</code></a> method (if available), but falls back to the <a href="https://developer.mozilla.org/docs/Web/API/Fetch_API" rel="nofollow"><code>fetch()</code></a> API when not.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import {onCLS, onINP, onLCP} from 'web-vitals'; function sendToAnalytics(metric) { // Replace with whatever serialization method you prefer. // Note: JSON.stringify will likely include more data than you need. const body = JSON.stringify(metric); // Use `navigator.sendBeacon()` if available, falling back to `fetch()`. (navigator.sendBeacon && navigator.sendBeacon('/analytics', body)) || fetch('/analytics', {body, method: 'POST', keepalive: true}); } onCLS(sendToAnalytics); onINP(sendToAnalytics); onLCP(sendToAnalytics);"><pre><span class="pl-k">import</span> <span class="pl-kos">{</span><span class="pl-s1">onCLS</span><span class="pl-kos">,</span> <span class="pl-s1">onINP</span><span class="pl-kos">,</span> <span class="pl-s1">onLCP</span><span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'web-vitals'</span><span class="pl-kos">;</span> <span class="pl-k">function</span> <span class="pl-en">sendToAnalytics</span><span class="pl-kos">(</span><span class="pl-s1">metric</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-c">// Replace with whatever serialization method you prefer.</span> <span class="pl-c">// Note: JSON.stringify will likely include more data than you need.</span> <span class="pl-k">const</span> <span class="pl-s1">body</span> <span class="pl-c1">=</span> <span class="pl-c1">JSON</span><span class="pl-kos">.</span><span class="pl-en">stringify</span><span class="pl-kos">(</span><span class="pl-s1">metric</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// Use `navigator.sendBeacon()` if available, falling back to `fetch()`.</span> <span class="pl-kos">(</span><span class="pl-s1">navigator</span><span class="pl-kos">.</span><span class="pl-c1">sendBeacon</span> <span class="pl-c1">&&</span> <span class="pl-s1">navigator</span><span class="pl-kos">.</span><span class="pl-en">sendBeacon</span><span class="pl-kos">(</span><span class="pl-s">'/analytics'</span><span class="pl-kos">,</span> <span class="pl-s1">body</span><span class="pl-kos">)</span><span class="pl-kos">)</span> <span class="pl-c1">||</span> <span class="pl-en">fetch</span><span class="pl-kos">(</span><span class="pl-s">'/analytics'</span><span class="pl-kos">,</span> <span class="pl-kos">{</span>body<span class="pl-kos">,</span> <span class="pl-c1">method</span>: <span class="pl-s">'POST'</span><span class="pl-kos">,</span> <span class="pl-c1">keepalive</span>: <span class="pl-c1">true</span><span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-en">onCLS</span><span class="pl-kos">(</span><span class="pl-s1">sendToAnalytics</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-en">onINP</span><span class="pl-kos">(</span><span class="pl-s1">sendToAnalytics</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-en">onLCP</span><span class="pl-kos">(</span><span class="pl-s1">sendToAnalytics</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Send the results to Google Analytics</h3><a id="user-content-send-the-results-to-google-analytics" class="anchor" aria-label="Permalink: Send the results to Google Analytics" href="#send-the-results-to-google-analytics"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Google Analytics does not support reporting metric distributions in any of its built-in reports; however, if you set a unique event parameter value (in this case, the metric_id, as shown in the example below) on every metric instance that you send to Google Analytics, you can create a report yourself by first getting the data via the <a href="https://developers.google.com/analytics/devguides/reporting/data/v1" rel="nofollow">Google Analytics Data API</a> or via <a href="https://support.google.com/analytics/answer/9358801" rel="nofollow">BigQuery export</a> and then visualizing it any charting library you choose.</p> <p dir="auto"><a href="https://support.google.com/analytics/answer/10089681" rel="nofollow">Google Analytics 4</a> introduces a new Event model allowing custom parameters instead of a fixed category, action, and label. It also supports non-integer values, making it easier to measure Web Vitals metrics compared to previous versions.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import {onCLS, onINP, onLCP} from 'web-vitals'; function sendToGoogleAnalytics({name, delta, value, id}) { // Assumes the global `gtag()` function exists, see: // https://developers.google.com/analytics/devguides/collection/ga4 gtag('event', name, { // Built-in params: value: delta, // Use `delta` so the value can be summed. // Custom params: metric_id: id, // Needed to aggregate events. metric_value: value, // Optional. metric_delta: delta, // Optional. // OPTIONAL: any additional params or debug info here. // See: https://web.dev/articles/debug-performance-in-the-field // metric_rating: 'good' | 'needs-improvement' | 'poor', // debug_info: '...', // ... }); } onCLS(sendToGoogleAnalytics); onINP(sendToGoogleAnalytics); onLCP(sendToGoogleAnalytics);"><pre><span class="pl-k">import</span> <span class="pl-kos">{</span><span class="pl-s1">onCLS</span><span class="pl-kos">,</span> <span class="pl-s1">onINP</span><span class="pl-kos">,</span> <span class="pl-s1">onLCP</span><span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'web-vitals'</span><span class="pl-kos">;</span> <span class="pl-k">function</span> <span class="pl-en">sendToGoogleAnalytics</span><span class="pl-kos">(</span><span class="pl-kos">{</span>name<span class="pl-kos">,</span> delta<span class="pl-kos">,</span> value<span class="pl-kos">,</span> id<span class="pl-kos">}</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-c">// Assumes the global `gtag()` function exists, see:</span> <span class="pl-c">// https://developers.google.com/analytics/devguides/collection/ga4</span> <span class="pl-en">gtag</span><span class="pl-kos">(</span><span class="pl-s">'event'</span><span class="pl-kos">,</span> <span class="pl-s1">name</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> <span class="pl-c">// Built-in params:</span> <span class="pl-c1">value</span>: <span class="pl-s1">delta</span><span class="pl-kos">,</span> <span class="pl-c">// Use `delta` so the value can be summed.</span> <span class="pl-c">// Custom params:</span> <span class="pl-c1">metric_id</span>: <span class="pl-s1">id</span><span class="pl-kos">,</span> <span class="pl-c">// Needed to aggregate events.</span> <span class="pl-c1">metric_value</span>: <span class="pl-s1">value</span><span class="pl-kos">,</span> <span class="pl-c">// Optional.</span> <span class="pl-c1">metric_delta</span>: <span class="pl-s1">delta</span><span class="pl-kos">,</span> <span class="pl-c">// Optional.</span> <span class="pl-c">// OPTIONAL: any additional params or debug info here.</span> <span class="pl-c">// See: https://web.dev/articles/debug-performance-in-the-field</span> <span class="pl-c">// metric_rating: 'good' | 'needs-improvement' | 'poor',</span> <span class="pl-c">// debug_info: '...',</span> <span class="pl-c">// ...</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-en">onCLS</span><span class="pl-kos">(</span><span class="pl-s1">sendToGoogleAnalytics</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-en">onINP</span><span class="pl-kos">(</span><span class="pl-s1">sendToGoogleAnalytics</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-en">onLCP</span><span class="pl-kos">(</span><span class="pl-s1">sendToGoogleAnalytics</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <p dir="auto">For details on how to query this data in <a href="https://cloud.google.com/bigquery" rel="nofollow">BigQuery</a>, or visualise it in <a href="https://lookerstudio.google.com/" rel="nofollow">Looker Studio</a>, see <a href="https://web.dev/articles/vitals-ga4" rel="nofollow">Measure and debug performance with Google Analytics 4 and BigQuery</a>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Send the results to Google Tag Manager</h3><a id="user-content-send-the-results-to-google-tag-manager" class="anchor" aria-label="Permalink: Send the results to Google Tag Manager" href="#send-the-results-to-google-tag-manager"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">While <code>web-vitals</code> can be called directly from Google Tag Manager, using a pre-defined custom template makes this considerably easier. Some recommended templates include:</p> <ul dir="auto"> <li><a href="https://tagmanager.google.com/gallery/#/owners/gtm-templates-simo-ahava/templates/core-web-vitals" rel="nofollow">Core Web Vitals</a> by <a href="https://www.simoahava.com/" rel="nofollow">Simo Ahava</a>. See <a href="https://www.simoahava.com/analytics/track-core-web-vitals-in-ga4-with-google-tag-manager/" rel="nofollow">Track Core Web Vitals in GA4 with Google Tag Manager</a> for usage and installation instructions.</li> <li><a href="https://github.com/google-marketing-solutions/web-vitals-gtm-template">Web Vitals Template for Google Tag Manager</a> by The Google Marketing Solutions team. See the <a href="https://github.com/google-marketing-solutions/web-vitals-gtm-template?tab=readme-ov-file#web-vitals-template-for-google-tag-manager">README</a> for usage and installation instructions.</li> </ul> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Send attribution data</h3><a id="user-content-send-attribution-data" class="anchor" aria-label="Permalink: Send attribution data" href="#send-attribution-data"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">When using the <a href="#attribution-build">attribution build</a>, you can send additional data to help you debug <em>why</em> the metric values are they way they are.</p> <p dir="auto">This example sends an additional <code>debug_target</code> param to Google Analytics, corresponding to the element most associated with each metric.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import {onCLS, onINP, onLCP} from 'web-vitals/attribution'; function sendToGoogleAnalytics({name, delta, value, id, attribution}) { const eventParams = { // Built-in params: value: delta, // Use `delta` so the value can be summed. // Custom params: metric_id: id, // Needed to aggregate events. metric_value: value, // Optional. metric_delta: delta, // Optional. }; switch (name) { case 'CLS': eventParams.debug_target = attribution.largestShiftTarget; break; case 'INP': eventParams.debug_target = attribution.interactionTarget; break; case 'LCP': eventParams.debug_target = attribution.element; break; } // Assumes the global `gtag()` function exists, see: // https://developers.google.com/analytics/devguides/collection/ga4 gtag('event', name, eventParams); } onCLS(sendToGoogleAnalytics); onINP(sendToGoogleAnalytics); onLCP(sendToGoogleAnalytics);"><pre><span class="pl-k">import</span> <span class="pl-kos">{</span><span class="pl-s1">onCLS</span><span class="pl-kos">,</span> <span class="pl-s1">onINP</span><span class="pl-kos">,</span> <span class="pl-s1">onLCP</span><span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'web-vitals/attribution'</span><span class="pl-kos">;</span> <span class="pl-k">function</span> <span class="pl-en">sendToGoogleAnalytics</span><span class="pl-kos">(</span><span class="pl-kos">{</span>name<span class="pl-kos">,</span> delta<span class="pl-kos">,</span> value<span class="pl-kos">,</span> id<span class="pl-kos">,</span> attribution<span class="pl-kos">}</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-k">const</span> <span class="pl-s1">eventParams</span> <span class="pl-c1">=</span> <span class="pl-kos">{</span> <span class="pl-c">// Built-in params:</span> <span class="pl-c1">value</span>: <span class="pl-s1">delta</span><span class="pl-kos">,</span> <span class="pl-c">// Use `delta` so the value can be summed.</span> <span class="pl-c">// Custom params:</span> <span class="pl-c1">metric_id</span>: <span class="pl-s1">id</span><span class="pl-kos">,</span> <span class="pl-c">// Needed to aggregate events.</span> <span class="pl-c1">metric_value</span>: <span class="pl-s1">value</span><span class="pl-kos">,</span> <span class="pl-c">// Optional.</span> <span class="pl-c1">metric_delta</span>: <span class="pl-s1">delta</span><span class="pl-kos">,</span> <span class="pl-c">// Optional.</span> <span class="pl-kos">}</span><span class="pl-kos">;</span> <span class="pl-k">switch</span> <span class="pl-kos">(</span><span class="pl-s1">name</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-k">case</span> <span class="pl-s">'CLS'</span>: <span class="pl-s1">eventParams</span><span class="pl-kos">.</span><span class="pl-c1">debug_target</span> <span class="pl-c1">=</span> <span class="pl-s1">attribution</span><span class="pl-kos">.</span><span class="pl-c1">largestShiftTarget</span><span class="pl-kos">;</span> <span class="pl-k">break</span><span class="pl-kos">;</span> <span class="pl-k">case</span> <span class="pl-s">'INP'</span>: <span class="pl-s1">eventParams</span><span class="pl-kos">.</span><span class="pl-c1">debug_target</span> <span class="pl-c1">=</span> <span class="pl-s1">attribution</span><span class="pl-kos">.</span><span class="pl-c1">interactionTarget</span><span class="pl-kos">;</span> <span class="pl-k">break</span><span class="pl-kos">;</span> <span class="pl-k">case</span> <span class="pl-s">'LCP'</span>: <span class="pl-s1">eventParams</span><span class="pl-kos">.</span><span class="pl-c1">debug_target</span> <span class="pl-c1">=</span> <span class="pl-s1">attribution</span><span class="pl-kos">.</span><span class="pl-c1">element</span><span class="pl-kos">;</span> <span class="pl-k">break</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-c">// Assumes the global `gtag()` function exists, see:</span> <span class="pl-c">// https://developers.google.com/analytics/devguides/collection/ga4</span> <span class="pl-en">gtag</span><span class="pl-kos">(</span><span class="pl-s">'event'</span><span class="pl-kos">,</span> <span class="pl-s1">name</span><span class="pl-kos">,</span> <span class="pl-s1">eventParams</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-en">onCLS</span><span class="pl-kos">(</span><span class="pl-s1">sendToGoogleAnalytics</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-en">onINP</span><span class="pl-kos">(</span><span class="pl-s1">sendToGoogleAnalytics</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-en">onLCP</span><span class="pl-kos">(</span><span class="pl-s1">sendToGoogleAnalytics</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <div class="markdown-alert markdown-alert-note" dir="auto"><p class="markdown-alert-title" dir="auto"><svg class="octicon octicon-info mr-2" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg>Note</p><p dir="auto">This example relies on custom <a href="https://support.google.com/analytics/answer/11396839" rel="nofollow">event parameters</a> in Google Analytics 4.</p> </div> <p dir="auto">See <a href="https://web.dev/articles/debug-performance-in-the-field" rel="nofollow">Debug performance in the field</a> for more information and examples.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Batch multiple reports together</h3><a id="user-content-batch-multiple-reports-together" class="anchor" aria-label="Permalink: Batch multiple reports together" href="#batch-multiple-reports-together"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Rather than reporting each individual Web Vitals metric separately, you can minimize your network usage by batching multiple metric reports together in a single network request.</p> <p dir="auto">However, since not all Web Vitals metrics become available at the same time, and since not all metrics are reported on every page, you cannot simply defer reporting until all metrics are available.</p> <p dir="auto">Instead, you should keep a queue of all metrics that were reported and flush the queue whenever the page is backgrounded or unloaded:</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import {onCLS, onINP, onLCP} from 'web-vitals'; const queue = new Set(); function addToQueue(metric) { queue.add(metric); } function flushQueue() { if (queue.size > 0) { // Replace with whatever serialization method you prefer. // Note: JSON.stringify will likely include more data than you need. const body = JSON.stringify([...queue]); // Use `navigator.sendBeacon()` if available, falling back to `fetch()`. (navigator.sendBeacon && navigator.sendBeacon('/analytics', body)) || fetch('/analytics', {body, method: 'POST', keepalive: true}); queue.clear(); } } onCLS(addToQueue); onINP(addToQueue); onLCP(addToQueue); // Report all available metrics whenever the page is backgrounded or unloaded. addEventListener('visibilitychange', () => { if (document.visibilityState === 'hidden') { flushQueue(); } });"><pre><span class="pl-k">import</span> <span class="pl-kos">{</span><span class="pl-s1">onCLS</span><span class="pl-kos">,</span> <span class="pl-s1">onINP</span><span class="pl-kos">,</span> <span class="pl-s1">onLCP</span><span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'web-vitals'</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">queue</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-v">Set</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">function</span> <span class="pl-en">addToQueue</span><span class="pl-kos">(</span><span class="pl-s1">metric</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-s1">queue</span><span class="pl-kos">.</span><span class="pl-en">add</span><span class="pl-kos">(</span><span class="pl-s1">metric</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-k">function</span> <span class="pl-en">flushQueue</span><span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-k">if</span> <span class="pl-kos">(</span><span class="pl-s1">queue</span><span class="pl-kos">.</span><span class="pl-c1">size</span> <span class="pl-c1">></span> <span class="pl-c1">0</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-c">// Replace with whatever serialization method you prefer.</span> <span class="pl-c">// Note: JSON.stringify will likely include more data than you need.</span> <span class="pl-k">const</span> <span class="pl-s1">body</span> <span class="pl-c1">=</span> <span class="pl-c1">JSON</span><span class="pl-kos">.</span><span class="pl-en">stringify</span><span class="pl-kos">(</span><span class="pl-kos">[</span>...<span class="pl-s1">queue</span><span class="pl-kos">]</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// Use `navigator.sendBeacon()` if available, falling back to `fetch()`.</span> <span class="pl-kos">(</span><span class="pl-s1">navigator</span><span class="pl-kos">.</span><span class="pl-c1">sendBeacon</span> <span class="pl-c1">&&</span> <span class="pl-s1">navigator</span><span class="pl-kos">.</span><span class="pl-en">sendBeacon</span><span class="pl-kos">(</span><span class="pl-s">'/analytics'</span><span class="pl-kos">,</span> <span class="pl-s1">body</span><span class="pl-kos">)</span><span class="pl-kos">)</span> <span class="pl-c1">||</span> <span class="pl-en">fetch</span><span class="pl-kos">(</span><span class="pl-s">'/analytics'</span><span class="pl-kos">,</span> <span class="pl-kos">{</span>body<span class="pl-kos">,</span> <span class="pl-c1">method</span>: <span class="pl-s">'POST'</span><span class="pl-kos">,</span> <span class="pl-c1">keepalive</span>: <span class="pl-c1">true</span><span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">queue</span><span class="pl-kos">.</span><span class="pl-en">clear</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-kos">}</span> <span class="pl-en">onCLS</span><span class="pl-kos">(</span><span class="pl-s1">addToQueue</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-en">onINP</span><span class="pl-kos">(</span><span class="pl-s1">addToQueue</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-en">onLCP</span><span class="pl-kos">(</span><span class="pl-s1">addToQueue</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// Report all available metrics whenever the page is backgrounded or unloaded.</span> <span class="pl-en">addEventListener</span><span class="pl-kos">(</span><span class="pl-s">'visibilitychange'</span><span class="pl-kos">,</span> <span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-kos">{</span> <span class="pl-k">if</span> <span class="pl-kos">(</span><span class="pl-smi">document</span><span class="pl-kos">.</span><span class="pl-c1">visibilityState</span> <span class="pl-c1">===</span> <span class="pl-s">'hidden'</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-en">flushQueue</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <div class="markdown-alert markdown-alert-note" dir="auto"><p class="markdown-alert-title" dir="auto"><svg class="octicon octicon-info mr-2" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg>Note</p><p dir="auto">See <a href="https://developers.google.com/web/updates/2018/07/page-lifecycle-api#legacy-lifecycle-apis-to-avoid" rel="nofollow">the Page Lifecycle guide</a> for an explanation of why <code>visibilitychange</code> is recommended over events like <code>beforeunload</code> and <code>unload</code>.</p> </div> <p dir="auto"><a name="user-content-bundle-versions"></a></p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Build options</h2><a id="user-content-build-options" class="anchor" aria-label="Permalink: Build options" href="#build-options"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The <code>web-vitals</code> package includes both "standard" and "attribution" builds, as well as different formats of each to allow developers to choose the format that best meets their needs or integrates with their architecture.</p> <p dir="auto">The following table lists all the builds distributed with the <code>web-vitals</code> package on npm.</p> <markdown-accessiblity-table><table> <tbody><tr> <td width="35%"> <strong>Filename</strong> <em>(all within <code>dist/*</code>)</em> </td> <td><strong>Export</strong></td> <td><strong>Description</strong></td> </tr> <tr> <td><code>web-vitals.js</code></td> <td><code>pkg.module</code></td> <td> <p dir="auto">An ES module bundle of all metric functions, without any attribution features.</p> This is the "standard" build and is the simplest way to consume this library out of the box. </td> </tr> <tr> <td><code>web-vitals.umd.cjs</code></td> <td><code>pkg.main</code></td> <td> A UMD version of the <code>web-vitals.js</code> bundle (exposed on the <code>self.webVitals.*</code> namespace). </td> </tr> <tr> <td><code>web-vitals.iife.js</code></td> <td>--</td> <td> An IIFE version of the <code>web-vitals.js</code> bundle (exposed on the <code>self.webVitals.*</code> namespace). </td> </tr> <tr> <td><code>web-vitals.attribution.js</code></td> <td>--</td> <td> An ES module version of all metric functions that includes <a href="#attribution-build">attribution</a> features. </td> </tr> <tr> <td><code>web-vitals.attribution.umd.cjs</code></td> <td>--</td> <td> A UMD version of the <code>web-vitals.attribution.js</code> build (exposed on the <code>self.webVitals.*</code> namespace). </td> </tr> <tr> <td><code>web-vitals.attribution.iife.js</code></td> <td>--</td> <td> An IIFE version of the <code>web-vitals.attribution.js</code> build (exposed on the <code>self.webVitals.*</code> namespace). </td> </tr> </tbody></table></markdown-accessiblity-table> <p dir="auto"><a name="user-content-which-build-is-right-for-you"></a></p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Which build is right for you?</h3><a id="user-content-which-build-is-right-for-you" class="anchor" aria-label="Permalink: Which build is right for you?" href="#which-build-is-right-for-you"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Most developers will generally want to use "standard" build (via either the ES module or UMD version, depending on your bundler/build system), as it's the easiest to use out of the box and integrate into existing tools.</p> <p dir="auto">However, if you'd lke to collect additional debug information to help you diagnose performance bottlenecks based on real-user issues, use the <a href="#attribution-build">"attribution" build</a>.</p> <p dir="auto">For guidance on how to collect and use real-user data to debug performance issues, see <a href="https://web.dev/debug-performance-in-the-field/" rel="nofollow">Debug performance in the field</a>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">API</h2><a id="user-content-api" class="anchor" aria-label="Permalink: API" href="#api"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Types:</h3><a id="user-content-types" class="anchor" aria-label="Permalink: Types:" href="#types"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto"><code>Metric</code></h4><a id="user-content-metric" class="anchor" aria-label="Permalink: Metric" href="#metric"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">All metrics types inherit from the following base interface:</p> <div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="interface Metric { /** * The name of the metric (in acronym form). */ name: 'CLS' | 'FCP' | 'FID' | 'INP' | 'LCP' | 'TTFB'; /** * The current value of the metric. */ value: number; /** * The rating as to whether the metric value is within the "good", * "needs improvement", or "poor" thresholds of the metric. */ rating: 'good' | 'needs-improvement' | 'poor'; /** * The delta between the current value and the last-reported value. * On the first report, `delta` and `value` will always be the same. */ delta: number; /** * A unique ID representing this particular metric instance. This ID can * be used by an analytics tool to dedupe multiple values sent for the same * metric instance, or to group multiple deltas together and calculate a * total. It can also be used to differentiate multiple different metric * instances sent from the same page, which can happen if the page is * restored from the back/forward cache (in that case new metrics object * get created). */ id: string; /** * Any performance entries relevant to the metric value calculation. * The array may also be empty if the metric value was not based on any * entries (e.g. a CLS value of 0 given no layout shifts). */ entries: PerformanceEntry[]; /** * The type of navigation. * * This will be the value returned by the Navigation Timing API (or * `undefined` if the browser doesn't support that API), with the following * exceptions: * - 'back-forward-cache': for pages that are restored from the bfcache. * - 'back_forward' is renamed to 'back-forward' for consistency. * - 'prerender': for pages that were prerendered. * - 'restore': for pages that were discarded by the browser and then * restored by the user. */ navigationType: | 'navigate' | 'reload' | 'back-forward' | 'back-forward-cache' | 'prerender' | 'restore'; }"><pre><span class="pl-k">interface</span> <span class="pl-smi">Metric</span> <span class="pl-kos">{</span> <span class="pl-c">/**</span> <span class="pl-c"> * The name of the metric (in acronym form).</span> <span class="pl-c"> */</span> <span class="pl-c1">name</span>: <span class="pl-s">'CLS'</span> <span class="pl-c1">|</span> <span class="pl-s">'FCP'</span> <span class="pl-c1">|</span> <span class="pl-s">'FID'</span> <span class="pl-c1">|</span> <span class="pl-s">'INP'</span> <span class="pl-c1">|</span> <span class="pl-s">'LCP'</span> <span class="pl-c1">|</span> <span class="pl-s">'TTFB'</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The current value of the metric.</span> <span class="pl-c"> */</span> <span class="pl-c1">value</span>: <span class="pl-smi">number</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The rating as to whether the metric value is within the "good",</span> <span class="pl-c"> * "needs improvement", or "poor" thresholds of the metric.</span> <span class="pl-c"> */</span> <span class="pl-c1">rating</span>: <span class="pl-s">'good'</span> <span class="pl-c1">|</span> <span class="pl-s">'needs-improvement'</span> <span class="pl-c1">|</span> <span class="pl-s">'poor'</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The delta between the current value and the last-reported value.</span> <span class="pl-c"> * On the first report, `delta` and `value` will always be the same.</span> <span class="pl-c"> */</span> <span class="pl-c1">delta</span>: <span class="pl-smi">number</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * A unique ID representing this particular metric instance. This ID can</span> <span class="pl-c"> * be used by an analytics tool to dedupe multiple values sent for the same</span> <span class="pl-c"> * metric instance, or to group multiple deltas together and calculate a</span> <span class="pl-c"> * total. It can also be used to differentiate multiple different metric</span> <span class="pl-c"> * instances sent from the same page, which can happen if the page is</span> <span class="pl-c"> * restored from the back/forward cache (in that case new metrics object</span> <span class="pl-c"> * get created).</span> <span class="pl-c"> */</span> <span class="pl-c1">id</span>: <span class="pl-smi">string</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * Any performance entries relevant to the metric value calculation.</span> <span class="pl-c"> * The array may also be empty if the metric value was not based on any</span> <span class="pl-c"> * entries (e.g. a CLS value of 0 given no layout shifts).</span> <span class="pl-c"> */</span> <span class="pl-c1">entries</span>: <span class="pl-smi">PerformanceEntry</span><span class="pl-kos">[</span><span class="pl-kos">]</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The type of navigation.</span> <span class="pl-c"> *</span> <span class="pl-c"> * This will be the value returned by the Navigation Timing API (or</span> <span class="pl-c"> * `undefined` if the browser doesn't support that API), with the following</span> <span class="pl-c"> * exceptions:</span> <span class="pl-c"> * - 'back-forward-cache': for pages that are restored from the bfcache.</span> <span class="pl-c"> * - 'back_forward' is renamed to 'back-forward' for consistency.</span> <span class="pl-c"> * - 'prerender': for pages that were prerendered.</span> <span class="pl-c"> * - 'restore': for pages that were discarded by the browser and then</span> <span class="pl-c"> * restored by the user.</span> <span class="pl-c"> */</span> <span class="pl-c1">navigationType</span>: <span class="pl-c1">|</span> <span class="pl-s">'navigate'</span> <span class="pl-c1">|</span> <span class="pl-s">'reload'</span> <span class="pl-c1">|</span> <span class="pl-s">'back-forward'</span> <span class="pl-c1">|</span> <span class="pl-s">'back-forward-cache'</span> <span class="pl-c1">|</span> <span class="pl-s">'prerender'</span> <span class="pl-c1">|</span> <span class="pl-s">'restore'</span><span class="pl-kos">;</span> <span class="pl-kos">}</span></pre></div> <p dir="auto">Metric-specific subclasses:</p> <div class="markdown-heading" dir="auto"><h5 tabindex="-1" class="heading-element" dir="auto"><code>CLSMetric</code></h5><a id="user-content-clsmetric" class="anchor" aria-label="Permalink: CLSMetric" href="#clsmetric"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="interface CLSMetric extends Metric { name: 'CLS'; entries: LayoutShift[]; }"><pre><span class="pl-k">interface</span> <span class="pl-smi">CLSMetric</span> <span class="pl-k">extends</span> <span class="pl-smi">Metric</span> <span class="pl-kos">{</span> <span class="pl-c1">name</span>: <span class="pl-s">'CLS'</span><span class="pl-kos">;</span> <span class="pl-c1">entries</span>: <span class="pl-smi">LayoutShift</span><span class="pl-kos">[</span><span class="pl-kos">]</span><span class="pl-kos">;</span> <span class="pl-kos">}</span></pre></div> <div class="markdown-heading" dir="auto"><h5 tabindex="-1" class="heading-element" dir="auto"><code>FCPMetric</code></h5><a id="user-content-fcpmetric" class="anchor" aria-label="Permalink: FCPMetric" href="#fcpmetric"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="interface FCPMetric extends Metric { name: 'FCP'; entries: PerformancePaintTiming[]; }"><pre><span class="pl-k">interface</span> <span class="pl-smi">FCPMetric</span> <span class="pl-k">extends</span> <span class="pl-smi">Metric</span> <span class="pl-kos">{</span> <span class="pl-c1">name</span>: <span class="pl-s">'FCP'</span><span class="pl-kos">;</span> <span class="pl-c1">entries</span>: <span class="pl-smi">PerformancePaintTiming</span><span class="pl-kos">[</span><span class="pl-kos">]</span><span class="pl-kos">;</span> <span class="pl-kos">}</span></pre></div> <div class="markdown-heading" dir="auto"><h5 tabindex="-1" class="heading-element" dir="auto"><code>FIDMetric</code></h5><a id="user-content-fidmetric" class="anchor" aria-label="Permalink: FIDMetric" href="#fidmetric"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-alert markdown-alert-caution" dir="auto"><p class="markdown-alert-title" dir="auto"><svg class="octicon octicon-stop mr-2" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M4.47.22A.749.749 0 0 1 5 0h6c.199 0 .389.079.53.22l4.25 4.25c.141.14.22.331.22.53v6a.749.749 0 0 1-.22.53l-4.25 4.25A.749.749 0 0 1 11 16H5a.749.749 0 0 1-.53-.22L.22 11.53A.749.749 0 0 1 0 11V5c0-.199.079-.389.22-.53Zm.84 1.28L1.5 5.31v5.38l3.81 3.81h5.38l3.81-3.81V5.31L10.69 1.5ZM8 4a.75.75 0 0 1 .75.75v3.5a.75.75 0 0 1-1.5 0v-3.5A.75.75 0 0 1 8 4Zm0 8a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg>Caution</p><p dir="auto">This interface is deprecated and will be removed in the next major release.</p> </div> <div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="interface FIDMetric extends Metric { name: 'FID'; entries: PerformanceEventTiming[]; }"><pre><span class="pl-k">interface</span> <span class="pl-smi">FIDMetric</span> <span class="pl-k">extends</span> <span class="pl-smi">Metric</span> <span class="pl-kos">{</span> <span class="pl-c1">name</span>: <span class="pl-s">'FID'</span><span class="pl-kos">;</span> <span class="pl-c1">entries</span>: <span class="pl-smi">PerformanceEventTiming</span><span class="pl-kos">[</span><span class="pl-kos">]</span><span class="pl-kos">;</span> <span class="pl-kos">}</span></pre></div> <div class="markdown-heading" dir="auto"><h5 tabindex="-1" class="heading-element" dir="auto"><code>INPMetric</code></h5><a id="user-content-inpmetric" class="anchor" aria-label="Permalink: INPMetric" href="#inpmetric"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="interface INPMetric extends Metric { name: 'INP'; entries: PerformanceEventTiming[]; }"><pre><span class="pl-k">interface</span> <span class="pl-smi">INPMetric</span> <span class="pl-k">extends</span> <span class="pl-smi">Metric</span> <span class="pl-kos">{</span> <span class="pl-c1">name</span>: <span class="pl-s">'INP'</span><span class="pl-kos">;</span> <span class="pl-c1">entries</span>: <span class="pl-smi">PerformanceEventTiming</span><span class="pl-kos">[</span><span class="pl-kos">]</span><span class="pl-kos">;</span> <span class="pl-kos">}</span></pre></div> <div class="markdown-heading" dir="auto"><h5 tabindex="-1" class="heading-element" dir="auto"><code>LCPMetric</code></h5><a id="user-content-lcpmetric" class="anchor" aria-label="Permalink: LCPMetric" href="#lcpmetric"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="interface LCPMetric extends Metric { name: 'LCP'; entries: LargestContentfulPaint[]; }"><pre><span class="pl-k">interface</span> <span class="pl-smi">LCPMetric</span> <span class="pl-k">extends</span> <span class="pl-smi">Metric</span> <span class="pl-kos">{</span> <span class="pl-c1">name</span>: <span class="pl-s">'LCP'</span><span class="pl-kos">;</span> <span class="pl-c1">entries</span>: <span class="pl-smi">LargestContentfulPaint</span><span class="pl-kos">[</span><span class="pl-kos">]</span><span class="pl-kos">;</span> <span class="pl-kos">}</span></pre></div> <div class="markdown-heading" dir="auto"><h5 tabindex="-1" class="heading-element" dir="auto"><code>TTFBMetric</code></h5><a id="user-content-ttfbmetric" class="anchor" aria-label="Permalink: TTFBMetric" href="#ttfbmetric"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="interface TTFBMetric extends Metric { name: 'TTFB'; entries: PerformanceNavigationTiming[]; }"><pre><span class="pl-k">interface</span> <span class="pl-smi">TTFBMetric</span> <span class="pl-k">extends</span> <span class="pl-smi">Metric</span> <span class="pl-kos">{</span> <span class="pl-c1">name</span>: <span class="pl-s">'TTFB'</span><span class="pl-kos">;</span> <span class="pl-c1">entries</span>: <span class="pl-smi">PerformanceNavigationTiming</span><span class="pl-kos">[</span><span class="pl-kos">]</span><span class="pl-kos">;</span> <span class="pl-kos">}</span></pre></div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto"><code>MetricRatingThresholds</code></h4><a id="user-content-metricratingthresholds" class="anchor" aria-label="Permalink: MetricRatingThresholds" href="#metricratingthresholds"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The thresholds of metric's "good", "needs improvement", and "poor" ratings.</p> <ul dir="auto"> <li>Metric values up to and including [0] are rated "good"</li> <li>Metric values up to and including [1] are rated "needs improvement"</li> <li>Metric values above [1] are "poor"</li> </ul> <markdown-accessiblity-table><table> <thead> <tr> <th>Metric value</th> <th>Rating</th> </tr> </thead> <tbody> <tr> <td>≦ [0]</td> <td>"good"</td> </tr> <tr> <td>> [0] and ≦ [1]</td> <td>"needs improvement"</td> </tr> <tr> <td>> [1]</td> <td>"poor"</td> </tr> </tbody> </table></markdown-accessiblity-table> <div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="type MetricRatingThresholds = [number, number];"><pre><span class="pl-k">type</span> <span class="pl-smi">MetricRatingThresholds</span> <span class="pl-c1">=</span> <span class="pl-kos">[</span><span class="pl-smi">number</span><span class="pl-kos">,</span> <span class="pl-smi">number</span><span class="pl-kos">]</span><span class="pl-kos">;</span></pre></div> <p dir="auto"><em>See also <a href="#rating-thresholds">Rating Thresholds</a>.</em></p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto"><code>ReportOpts</code></h4><a id="user-content-reportopts" class="anchor" aria-label="Permalink: ReportOpts" href="#reportopts"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="interface ReportOpts { reportAllChanges?: boolean; durationThreshold?: number; }"><pre><span class="pl-k">interface</span> <span class="pl-smi">ReportOpts</span> <span class="pl-kos">{</span> <span class="pl-c1">reportAllChanges</span>?: <span class="pl-smi">boolean</span><span class="pl-kos">;</span> <span class="pl-c1">durationThreshold</span>?: <span class="pl-smi">number</span><span class="pl-kos">;</span> <span class="pl-kos">}</span></pre></div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto"><code>LoadState</code></h4><a id="user-content-loadstate" class="anchor" aria-label="Permalink: LoadState" href="#loadstate"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The <code>LoadState</code> type is used in several of the metric <a href="#attribution">attribution objects</a>.</p> <div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="/** * The loading state of the document. Note: this value is similar to * `document.readyState` but it subdivides the "interactive" state into the * time before and after the DOMContentLoaded event fires. * * State descriptions: * - `loading`: the initial document response has not yet been fully downloaded * and parsed. This is equivalent to the corresponding `readyState` value. * - `dom-interactive`: the document has been fully loaded and parsed, but * scripts may not have yet finished loading and executing. * - `dom-content-loaded`: the document is fully loaded and parsed, and all * scripts (except `async` scripts) have loaded and finished executing. * - `complete`: the document and all of its sub-resources have finished * loading. This is equivalent to the corresponding `readyState` value. */ type LoadState = | 'loading' | 'dom-interactive' | 'dom-content-loaded' | 'complete';"><pre><span class="pl-c">/**</span> <span class="pl-c"> * The loading state of the document. Note: this value is similar to</span> <span class="pl-c"> * `document.readyState` but it subdivides the "interactive" state into the</span> <span class="pl-c"> * time before and after the DOMContentLoaded event fires.</span> <span class="pl-c"> *</span> <span class="pl-c"> * State descriptions:</span> <span class="pl-c"> * - `loading`: the initial document response has not yet been fully downloaded</span> <span class="pl-c"> * and parsed. This is equivalent to the corresponding `readyState` value.</span> <span class="pl-c"> * - `dom-interactive`: the document has been fully loaded and parsed, but</span> <span class="pl-c"> * scripts may not have yet finished loading and executing.</span> <span class="pl-c"> * - `dom-content-loaded`: the document is fully loaded and parsed, and all</span> <span class="pl-c"> * scripts (except `async` scripts) have loaded and finished executing.</span> <span class="pl-c"> * - `complete`: the document and all of its sub-resources have finished</span> <span class="pl-c"> * loading. This is equivalent to the corresponding `readyState` value.</span> <span class="pl-c"> */</span> <span class="pl-k">type</span> <span class="pl-smi">LoadState</span> <span class="pl-c1">=</span> <span class="pl-c1">|</span> <span class="pl-s">'loading'</span> <span class="pl-c1">|</span> <span class="pl-s">'dom-interactive'</span> <span class="pl-c1">|</span> <span class="pl-s">'dom-content-loaded'</span> <span class="pl-c1">|</span> <span class="pl-s">'complete'</span><span class="pl-kos">;</span></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Functions:</h3><a id="user-content-functions" class="anchor" aria-label="Permalink: Functions:" href="#functions"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto"><code>onCLS()</code></h4><a id="user-content-oncls" class="anchor" aria-label="Permalink: onCLS()" href="#oncls"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="function onCLS(callback: (metric: CLSMetric) => void, opts?: ReportOpts): void;"><pre><span class="pl-k">function</span> <span class="pl-s1">onCLS</span><span class="pl-kos">(</span><span class="pl-s1">callback</span>: <span class="pl-kos">(</span><span class="pl-s1">metric</span>: <span class="pl-smi">CLSMetric</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-smi"><span class="pl-k">void</span></span><span class="pl-kos">,</span> <span class="pl-s1">opts</span>?: <span class="pl-smi">ReportOpts</span><span class="pl-kos">)</span>: <span class="pl-smi"><span class="pl-k">void</span></span><span class="pl-kos">;</span></pre></div> <p dir="auto">Calculates the <a href="https://web.dev/articles/cls" rel="nofollow">CLS</a> value for the current page and calls the <code>callback</code> function once the value is ready to be reported, along with all <code>layout-shift</code> performance entries that were used in the metric value calculation. The reported value is a <a href="https://heycam.github.io/webidl/#idl-double" rel="nofollow">double</a> (corresponding to a <a href="https://web.dev/articles/cls#layout_shift_score" rel="nofollow">layout shift score</a>).</p> <p dir="auto">If the <code>reportAllChanges</code> <a href="#reportopts">configuration option</a> is set to <code>true</code>, the <code>callback</code> function will be called as soon as the value is initially determined as well as any time the value changes throughout the page lifespan (Note <a href="#report-the-value-on-every-change">not necessarily for every layout shift</a>).</p> <div class="markdown-alert markdown-alert-important" dir="auto"><p class="markdown-alert-title" dir="auto"><svg class="octicon octicon-report mr-2" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M0 1.75C0 .784.784 0 1.75 0h12.5C15.216 0 16 .784 16 1.75v9.5A1.75 1.75 0 0 1 14.25 13H8.06l-2.573 2.573A1.458 1.458 0 0 1 3 14.543V13H1.75A1.75 1.75 0 0 1 0 11.25Zm1.75-.25a.25.25 0 0 0-.25.25v9.5c0 .138.112.25.25.25h2a.75.75 0 0 1 .75.75v2.19l2.72-2.72a.749.749 0 0 1 .53-.22h6.5a.25.25 0 0 0 .25-.25v-9.5a.25.25 0 0 0-.25-.25Zm7 2.25v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 9a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path></svg>Important</p><p dir="auto">CLS should be continually monitored for changes throughout the entire lifespan of a page—including if the user returns to the page after it's been hidden/backgrounded. However, since browsers often <a href="https://developer.chrome.com/blog/page-lifecycle-api/#advice-hidden" rel="nofollow">will not fire additional callbacks once the user has backgrounded a page</a>, <code>callback</code> is always called when the page's visibility state changes to hidden. As a result, the <code>callback</code> function might be called multiple times during the same page load (see <a href="#report-only-the-delta-of-changes">Reporting only the delta of changes</a> for how to manage this).</p> </div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto"><code>onFCP()</code></h4><a id="user-content-onfcp" class="anchor" aria-label="Permalink: onFCP()" href="#onfcp"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="function onFCP(callback: (metric: FCPMetric) => void, opts?: ReportOpts): void;"><pre><span class="pl-k">function</span> <span class="pl-s1">onFCP</span><span class="pl-kos">(</span><span class="pl-s1">callback</span>: <span class="pl-kos">(</span><span class="pl-s1">metric</span>: <span class="pl-smi">FCPMetric</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-smi"><span class="pl-k">void</span></span><span class="pl-kos">,</span> <span class="pl-s1">opts</span>?: <span class="pl-smi">ReportOpts</span><span class="pl-kos">)</span>: <span class="pl-smi"><span class="pl-k">void</span></span><span class="pl-kos">;</span></pre></div> <p dir="auto">Calculates the <a href="https://web.dev/articles/fcp" rel="nofollow">FCP</a> value for the current page and calls the <code>callback</code> function once the value is ready, along with the relevant <code>paint</code> performance entry used to determine the value. The reported value is a <a href="https://developer.mozilla.org/docs/Web/API/DOMHighResTimeStamp" rel="nofollow"><code>DOMHighResTimeStamp</code></a>.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto"><code>onFID()</code></h4><a id="user-content-onfid" class="anchor" aria-label="Permalink: onFID()" href="#onfid"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-alert markdown-alert-caution" dir="auto"><p class="markdown-alert-title" dir="auto"><svg class="octicon octicon-stop mr-2" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M4.47.22A.749.749 0 0 1 5 0h6c.199 0 .389.079.53.22l4.25 4.25c.141.14.22.331.22.53v6a.749.749 0 0 1-.22.53l-4.25 4.25A.749.749 0 0 1 11 16H5a.749.749 0 0 1-.53-.22L.22 11.53A.749.749 0 0 1 0 11V5c0-.199.079-.389.22-.53Zm.84 1.28L1.5 5.31v5.38l3.81 3.81h5.38l3.81-3.81V5.31L10.69 1.5ZM8 4a.75.75 0 0 1 .75.75v3.5a.75.75 0 0 1-1.5 0v-3.5A.75.75 0 0 1 8 4Zm0 8a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg>Caution</p><p dir="auto">This function is deprecated and will be removed in the next major release.</p> </div> <div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="function onFID(callback: (metric: FIDMetric) => void, opts?: ReportOpts): void;"><pre><span class="pl-k">function</span> <span class="pl-s1">onFID</span><span class="pl-kos">(</span><span class="pl-s1">callback</span>: <span class="pl-kos">(</span><span class="pl-s1">metric</span>: <span class="pl-smi">FIDMetric</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-smi"><span class="pl-k">void</span></span><span class="pl-kos">,</span> <span class="pl-s1">opts</span>?: <span class="pl-smi">ReportOpts</span><span class="pl-kos">)</span>: <span class="pl-smi"><span class="pl-k">void</span></span><span class="pl-kos">;</span></pre></div> <p dir="auto">Calculates the <a href="https://web.dev/articles/fid" rel="nofollow">FID</a> value for the current page and calls the <code>callback</code> function once the value is ready, along with the relevant <code>first-input</code> performance entry used to determine the value. The reported value is a <a href="https://developer.mozilla.org/docs/Web/API/DOMHighResTimeStamp" rel="nofollow"><code>DOMHighResTimeStamp</code></a>.</p> <div class="markdown-alert markdown-alert-important" dir="auto"><p class="markdown-alert-title" dir="auto"><svg class="octicon octicon-report mr-2" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M0 1.75C0 .784.784 0 1.75 0h12.5C15.216 0 16 .784 16 1.75v9.5A1.75 1.75 0 0 1 14.25 13H8.06l-2.573 2.573A1.458 1.458 0 0 1 3 14.543V13H1.75A1.75 1.75 0 0 1 0 11.25Zm1.75-.25a.25.25 0 0 0-.25.25v9.5c0 .138.112.25.25.25h2a.75.75 0 0 1 .75.75v2.19l2.72-2.72a.749.749 0 0 1 .53-.22h6.5a.25.25 0 0 0 .25-.25v-9.5a.25.25 0 0 0-.25-.25Zm7 2.25v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 9a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path></svg>Important</p><p dir="auto">Since FID is only reported after the user interacts with the page, it's possible that it will not be reported for some page loads.</p> </div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto"><code>onINP()</code></h4><a id="user-content-oninp" class="anchor" aria-label="Permalink: onINP()" href="#oninp"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="function onINP(callback: (metric: INPMetric) => void, opts?: ReportOpts): void;"><pre><span class="pl-k">function</span> <span class="pl-s1">onINP</span><span class="pl-kos">(</span><span class="pl-s1">callback</span>: <span class="pl-kos">(</span><span class="pl-s1">metric</span>: <span class="pl-smi">INPMetric</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-smi"><span class="pl-k">void</span></span><span class="pl-kos">,</span> <span class="pl-s1">opts</span>?: <span class="pl-smi">ReportOpts</span><span class="pl-kos">)</span>: <span class="pl-smi"><span class="pl-k">void</span></span><span class="pl-kos">;</span></pre></div> <p dir="auto">Calculates the <a href="https://web.dev/articles/inp" rel="nofollow">INP</a> value for the current page and calls the <code>callback</code> function once the value is ready, along with the <code>event</code> performance entries reported for that interaction. The reported value is a <a href="https://developer.mozilla.org/docs/Web/API/DOMHighResTimeStamp" rel="nofollow"><code>DOMHighResTimeStamp</code></a>.</p> <p dir="auto">A custom <code>durationThreshold</code> <a href="#reportopts">configuration option</a> can optionally be passed to control what <code>event-timing</code> entries are considered for INP reporting. The default threshold is <code>40</code>, which means INP scores of less than 40 are reported as 0. Note that this will not affect your 75th percentile INP value unless that value is also less than 40 (well below the recommended <a href="https://web.dev/articles/inp#what_is_a_good_inp_score" rel="nofollow">good</a> threshold).</p> <p dir="auto">If the <code>reportAllChanges</code> <a href="#reportopts">configuration option</a> is set to <code>true</code>, the <code>callback</code> function will be called as soon as the value is initially determined as well as any time the value changes throughout the page lifespan (Note <a href="#report-the-value-on-every-change">not necessarily for every interaction</a>).</p> <div class="markdown-alert markdown-alert-important" dir="auto"><p class="markdown-alert-title" dir="auto"><svg class="octicon octicon-report mr-2" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M0 1.75C0 .784.784 0 1.75 0h12.5C15.216 0 16 .784 16 1.75v9.5A1.75 1.75 0 0 1 14.25 13H8.06l-2.573 2.573A1.458 1.458 0 0 1 3 14.543V13H1.75A1.75 1.75 0 0 1 0 11.25Zm1.75-.25a.25.25 0 0 0-.25.25v9.5c0 .138.112.25.25.25h2a.75.75 0 0 1 .75.75v2.19l2.72-2.72a.749.749 0 0 1 .53-.22h6.5a.25.25 0 0 0 .25-.25v-9.5a.25.25 0 0 0-.25-.25Zm7 2.25v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 9a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path></svg>Important</p><p dir="auto">INP should be continually monitored for changes throughout the entire lifespan of a page—including if the user returns to the page after it's been hidden/backgrounded. However, since browsers often <a href="https://developer.chrome.com/blog/page-lifecycle-api/#advice-hidden" rel="nofollow">will not fire additional callbacks once the user has backgrounded a page</a>, <code>callback</code> is always called when the page's visibility state changes to hidden. As a result, the <code>callback</code> function might be called multiple times during the same page load (see <a href="#report-only-the-delta-of-changes">Reporting only the delta of changes</a> for how to manage this).</p> </div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto"><code>onLCP()</code></h4><a id="user-content-onlcp" class="anchor" aria-label="Permalink: onLCP()" href="#onlcp"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="function onLCP(callback: (metric: LCPMetric) => void, opts?: ReportOpts): void;"><pre><span class="pl-k">function</span> <span class="pl-s1">onLCP</span><span class="pl-kos">(</span><span class="pl-s1">callback</span>: <span class="pl-kos">(</span><span class="pl-s1">metric</span>: <span class="pl-smi">LCPMetric</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-smi"><span class="pl-k">void</span></span><span class="pl-kos">,</span> <span class="pl-s1">opts</span>?: <span class="pl-smi">ReportOpts</span><span class="pl-kos">)</span>: <span class="pl-smi"><span class="pl-k">void</span></span><span class="pl-kos">;</span></pre></div> <p dir="auto">Calculates the <a href="https://web.dev/articles/lcp" rel="nofollow">LCP</a> value for the current page and calls the <code>callback</code> function once the value is ready (along with the relevant <code>largest-contentful-paint</code> performance entry used to determine the value). The reported value is a <a href="https://developer.mozilla.org/docs/Web/API/DOMHighResTimeStamp" rel="nofollow"><code>DOMHighResTimeStamp</code></a>.</p> <p dir="auto">If the <code>reportAllChanges</code> <a href="#reportopts">configuration option</a> is set to <code>true</code>, the <code>callback</code> function will be called any time a new <code>largest-contentful-paint</code> performance entry is dispatched, or once the final value of the metric has been determined.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto"><code>onTTFB()</code></h4><a id="user-content-onttfb" class="anchor" aria-label="Permalink: onTTFB()" href="#onttfb"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="function onTTFB( callback: (metric: TTFBMetric) => void, opts?: ReportOpts, ): void;"><pre><span class="pl-k">function</span> <span class="pl-s1">onTTFB</span><span class="pl-kos">(</span> <span class="pl-s1">callback</span>: <span class="pl-kos">(</span><span class="pl-s1">metric</span>: <span class="pl-smi">TTFBMetric</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-smi"><span class="pl-k">void</span></span><span class="pl-kos">,</span> <span class="pl-s1">opts</span>?: <span class="pl-smi">ReportOpts</span><span class="pl-kos">,</span> <span class="pl-kos">)</span>: <span class="pl-smi"><span class="pl-k">void</span></span><span class="pl-kos">;</span></pre></div> <p dir="auto">Calculates the <a href="https://web.dev/articles/ttfb" rel="nofollow">TTFB</a> value for the current page and calls the <code>callback</code> function once the page has loaded, along with the relevant <code>navigation</code> performance entry used to determine the value. The reported value is a <a href="https://developer.mozilla.org/docs/Web/API/DOMHighResTimeStamp" rel="nofollow"><code>DOMHighResTimeStamp</code></a>.</p> <p dir="auto">Note, this function waits until after the page is loaded to call <code>callback</code> in order to ensure all properties of the <code>navigation</code> entry are populated. This is useful if you want to report on other metrics exposed by the <a href="https://w3c.github.io/navigation-timing/" rel="nofollow">Navigation Timing API</a>.</p> <p dir="auto">For example, the TTFB metric starts from the page's <a href="https://www.w3.org/TR/hr-time-2/#sec-time-origin" rel="nofollow">time origin</a>, which means it includes time spent on DNS lookup, connection negotiation, network latency, and server processing time.</p> <div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import {onTTFB} from 'web-vitals'; onTTFB((metric) => { // Calculate the request time by subtracting from TTFB // everything that happened prior to the request starting. const requestTime = metric.value - metric.entries[0].requestStart; console.log('Request time:', requestTime); });"><pre><span class="pl-k">import</span> <span class="pl-kos">{</span><span class="pl-s1">onTTFB</span><span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'web-vitals'</span><span class="pl-kos">;</span> <span class="pl-en">onTTFB</span><span class="pl-kos">(</span><span class="pl-kos">(</span><span class="pl-s1">metric</span><span class="pl-kos">)</span> <span class="pl-c1">=></span> <span class="pl-kos">{</span> <span class="pl-c">// Calculate the request time by subtracting from TTFB</span> <span class="pl-c">// everything that happened prior to the request starting.</span> <span class="pl-k">const</span> <span class="pl-s1">requestTime</span> <span class="pl-c1">=</span> <span class="pl-s1">metric</span><span class="pl-kos">.</span><span class="pl-c1">value</span> <span class="pl-c1">-</span> <span class="pl-s1">metric</span><span class="pl-kos">.</span><span class="pl-c1">entries</span><span class="pl-kos">[</span><span class="pl-c1">0</span><span class="pl-kos">]</span><span class="pl-kos">.</span><span class="pl-c1">requestStart</span><span class="pl-kos">;</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-s">'Request time:'</span><span class="pl-kos">,</span> <span class="pl-s1">requestTime</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div> <div class="markdown-alert markdown-alert-note" dir="auto"><p class="markdown-alert-title" dir="auto"><svg class="octicon octicon-info mr-2" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg>Note</p><p dir="auto">Browsers that do not support <code>navigation</code> entries will fall back to using <code>performance.timing</code> (with the timestamps converted from epoch time to <a href="https://developer.mozilla.org/docs/Web/API/DOMHighResTimeStamp" rel="nofollow"><code>DOMHighResTimeStamp</code></a>). This ensures code referencing these values (like in the example above) will work the same in all browsers.</p> </div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Rating Thresholds:</h3><a id="user-content-rating-thresholds" class="anchor" aria-label="Permalink: Rating Thresholds:" href="#rating-thresholds"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The thresholds of each metric's "good", "needs improvement", and "poor" ratings are available as <a href="#metricratingthresholds"><code>MetricRatingThresholds</code></a>.</p> <p dir="auto">Example:</p> <div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import {CLSThresholds, INPThresholds, LCPThresholds} from 'web-vitals'; console.log(CLSThresholds); // [ 0.1, 0.25 ] console.log(INPThresholds); // [ 200, 500 ] console.log(LCPThresholds); // [ 2500, 4000 ]"><pre><span class="pl-k">import</span> <span class="pl-kos">{</span><span class="pl-smi">CLSThresholds</span><span class="pl-kos">,</span> <span class="pl-smi">INPThresholds</span><span class="pl-kos">,</span> <span class="pl-smi">LCPThresholds</span><span class="pl-kos">}</span> <span class="pl-k">from</span> <span class="pl-s">'web-vitals'</span><span class="pl-kos">;</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-smi">CLSThresholds</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// [ 0.1, 0.25 ]</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-smi">INPThresholds</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// [ 200, 500 ]</span> <span class="pl-smi">console</span><span class="pl-kos">.</span><span class="pl-en">log</span><span class="pl-kos">(</span><span class="pl-smi">LCPThresholds</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// [ 2500, 4000 ]</span></pre></div> <div class="markdown-alert markdown-alert-note" dir="auto"><p class="markdown-alert-title" dir="auto"><svg class="octicon octicon-info mr-2" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg>Note</p><p dir="auto">It's typically not necessary (or recommended) to manually calculate metric value ratings using these thresholds. Use the <a href="#metric"><code>Metric['rating']</code></a> instead.</p> </div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Attribution:</h3><a id="user-content-attribution" class="anchor" aria-label="Permalink: Attribution:" href="#attribution"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The following objects contain potentially-helpful debugging information that can be sent along with the metric values for the current page visit in order to help identify issues happening to real-users in the field.</p> <p dir="auto">When using the attribution build, these objects are found as an <code>attribution</code> property on each metric.</p> <p dir="auto">See the <a href="#attribution-build">attribution build</a> section for details on how to use this feature.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto"><code>CLSAttribution</code></h4><a id="user-content-clsattribution" class="anchor" aria-label="Permalink: CLSAttribution" href="#clsattribution"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="interface CLSAttribution { /** * A selector identifying the first element (in document order) that * shifted when the single largest layout shift contributing to the page's * CLS score occurred. */ largestShiftTarget?: string; /** * The time when the single largest layout shift contributing to the page's * CLS score occurred. */ largestShiftTime?: DOMHighResTimeStamp; /** * The layout shift score of the single largest layout shift contributing to * the page's CLS score. */ largestShiftValue?: number; /** * The `LayoutShiftEntry` representing the single largest layout shift * contributing to the page's CLS score. (Useful when you need more than just * `largestShiftTarget`, `largestShiftTime`, and `largestShiftValue`). */ largestShiftEntry?: LayoutShift; /** * The first element source (in document order) among the `sources` list * of the `largestShiftEntry` object. (Also useful when you need more than * just `largestShiftTarget`, `largestShiftTime`, and `largestShiftValue`). */ largestShiftSource?: LayoutShiftAttribution; /** * The loading state of the document at the time when the largest layout * shift contribution to the page's CLS score occurred (see `LoadState` * for details). */ loadState?: LoadState; }"><pre><span class="pl-k">interface</span> <span class="pl-smi">CLSAttribution</span> <span class="pl-kos">{</span> <span class="pl-c">/**</span> <span class="pl-c"> * A selector identifying the first element (in document order) that</span> <span class="pl-c"> * shifted when the single largest layout shift contributing to the page's</span> <span class="pl-c"> * CLS score occurred.</span> <span class="pl-c"> */</span> <span class="pl-c1">largestShiftTarget</span>?: <span class="pl-smi">string</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The time when the single largest layout shift contributing to the page's</span> <span class="pl-c"> * CLS score occurred.</span> <span class="pl-c"> */</span> <span class="pl-c1">largestShiftTime</span>?: <span class="pl-smi">DOMHighResTimeStamp</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The layout shift score of the single largest layout shift contributing to</span> <span class="pl-c"> * the page's CLS score.</span> <span class="pl-c"> */</span> <span class="pl-c1">largestShiftValue</span>?: <span class="pl-smi">number</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The `LayoutShiftEntry` representing the single largest layout shift</span> <span class="pl-c"> * contributing to the page's CLS score. (Useful when you need more than just</span> <span class="pl-c"> * `largestShiftTarget`, `largestShiftTime`, and `largestShiftValue`).</span> <span class="pl-c"> */</span> <span class="pl-c1">largestShiftEntry</span>?: <span class="pl-smi">LayoutShift</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The first element source (in document order) among the `sources` list</span> <span class="pl-c"> * of the `largestShiftEntry` object. (Also useful when you need more than</span> <span class="pl-c"> * just `largestShiftTarget`, `largestShiftTime`, and `largestShiftValue`).</span> <span class="pl-c"> */</span> <span class="pl-c1">largestShiftSource</span>?: <span class="pl-smi">LayoutShiftAttribution</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The loading state of the document at the time when the largest layout</span> <span class="pl-c"> * shift contribution to the page's CLS score occurred (see `LoadState`</span> <span class="pl-c"> * for details).</span> <span class="pl-c"> */</span> <span class="pl-c1">loadState</span>?: <span class="pl-smi">LoadState</span><span class="pl-kos">;</span> <span class="pl-kos">}</span></pre></div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto"><code>FCPAttribution</code></h4><a id="user-content-fcpattribution" class="anchor" aria-label="Permalink: FCPAttribution" href="#fcpattribution"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="interface FCPAttribution { /** * The time from when the user initiates loading the page until when the * browser receives the first byte of the response (a.k.a. TTFB). */ timeToFirstByte: number; /** * The delta between TTFB and the first contentful paint (FCP). */ firstByteToFCP: number; /** * The loading state of the document at the time when FCP `occurred (see * `LoadState` for details). Ideally, documents can paint before they finish * loading (e.g. the `loading` or `dom-interactive` phases). */ loadState: LoadState; /** * The `PerformancePaintTiming` entry corresponding to FCP. */ fcpEntry?: PerformancePaintTiming; /** * The `navigation` entry of the current page, which is useful for diagnosing * general page load issues. This can be used to access `serverTiming` for example: * navigationEntry?.serverTiming */ navigationEntry?: PerformanceNavigationTiming; }"><pre><span class="pl-k">interface</span> <span class="pl-smi">FCPAttribution</span> <span class="pl-kos">{</span> <span class="pl-c">/**</span> <span class="pl-c"> * The time from when the user initiates loading the page until when the</span> <span class="pl-c"> * browser receives the first byte of the response (a.k.a. TTFB).</span> <span class="pl-c"> */</span> <span class="pl-c1">timeToFirstByte</span>: <span class="pl-smi">number</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The delta between TTFB and the first contentful paint (FCP).</span> <span class="pl-c"> */</span> <span class="pl-c1">firstByteToFCP</span>: <span class="pl-smi">number</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The loading state of the document at the time when FCP `occurred (see</span> <span class="pl-c"> * `LoadState` for details). Ideally, documents can paint before they finish</span> <span class="pl-c"> * loading (e.g. the `loading` or `dom-interactive` phases).</span> <span class="pl-c"> */</span> <span class="pl-c1">loadState</span>: <span class="pl-smi">LoadState</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The `PerformancePaintTiming` entry corresponding to FCP.</span> <span class="pl-c"> */</span> <span class="pl-c1">fcpEntry</span>?: <span class="pl-smi">PerformancePaintTiming</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The `navigation` entry of the current page, which is useful for diagnosing</span> <span class="pl-c"> * general page load issues. This can be used to access `serverTiming` for example:</span> <span class="pl-c"> * navigationEntry?.serverTiming</span> <span class="pl-c"> */</span> <span class="pl-c1">navigationEntry</span>?: <span class="pl-smi">PerformanceNavigationTiming</span><span class="pl-kos">;</span> <span class="pl-kos">}</span></pre></div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto"><code>FIDAttribution</code></h4><a id="user-content-fidattribution" class="anchor" aria-label="Permalink: FIDAttribution" href="#fidattribution"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-alert markdown-alert-caution" dir="auto"><p class="markdown-alert-title" dir="auto"><svg class="octicon octicon-stop mr-2" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M4.47.22A.749.749 0 0 1 5 0h6c.199 0 .389.079.53.22l4.25 4.25c.141.14.22.331.22.53v6a.749.749 0 0 1-.22.53l-4.25 4.25A.749.749 0 0 1 11 16H5a.749.749 0 0 1-.53-.22L.22 11.53A.749.749 0 0 1 0 11V5c0-.199.079-.389.22-.53Zm.84 1.28L1.5 5.31v5.38l3.81 3.81h5.38l3.81-3.81V5.31L10.69 1.5ZM8 4a.75.75 0 0 1 .75.75v3.5a.75.75 0 0 1-1.5 0v-3.5A.75.75 0 0 1 8 4Zm0 8a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg>Caution</p><p dir="auto">This interface is deprecated and will be removed in the next major release.</p> </div> <div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="interface FIDAttribution { /** * A selector identifying the element that the user interacted with. This * element will be the `target` of the `event` dispatched. */ eventTarget: string; /** * The time when the user interacted. This time will match the `timeStamp` * value of the `event` dispatched. */ eventTime: number; /** * The `type` of the `event` dispatched from the user interaction. */ eventType: string; /** * The `PerformanceEventTiming` entry corresponding to FID. */ eventEntry: PerformanceEventTiming; /** * The loading state of the document at the time when the first interaction * occurred (see `LoadState` for details). If the first interaction occurred * while the document was loading and executing script (e.g. usually in the * `dom-interactive` phase) it can result in long input delays. */ loadState: LoadState; }"><pre><span class="pl-k">interface</span> <span class="pl-smi">FIDAttribution</span> <span class="pl-kos">{</span> <span class="pl-c">/**</span> <span class="pl-c"> * A selector identifying the element that the user interacted with. This</span> <span class="pl-c"> * element will be the `target` of the `event` dispatched.</span> <span class="pl-c"> */</span> <span class="pl-c1">eventTarget</span>: <span class="pl-smi">string</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The time when the user interacted. This time will match the `timeStamp`</span> <span class="pl-c"> * value of the `event` dispatched.</span> <span class="pl-c"> */</span> <span class="pl-c1">eventTime</span>: <span class="pl-smi">number</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The `type` of the `event` dispatched from the user interaction.</span> <span class="pl-c"> */</span> <span class="pl-c1">eventType</span>: <span class="pl-smi">string</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The `PerformanceEventTiming` entry corresponding to FID.</span> <span class="pl-c"> */</span> <span class="pl-c1">eventEntry</span>: <span class="pl-smi">PerformanceEventTiming</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The loading state of the document at the time when the first interaction</span> <span class="pl-c"> * occurred (see `LoadState` for details). If the first interaction occurred</span> <span class="pl-c"> * while the document was loading and executing script (e.g. usually in the</span> <span class="pl-c"> * `dom-interactive` phase) it can result in long input delays.</span> <span class="pl-c"> */</span> <span class="pl-c1">loadState</span>: <span class="pl-smi">LoadState</span><span class="pl-kos">;</span> <span class="pl-kos">}</span></pre></div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto"><code>INPAttribution</code></h4><a id="user-content-inpattribution" class="anchor" aria-label="Permalink: INPAttribution" href="#inpattribution"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="interface INPAttribution { /** * A selector identifying the element that the user first interacted with * as part of the frame where the INP candidate interaction occurred. * If this value is an empty string, that generally means the element was * removed from the DOM after the interaction. */ interactionTarget: string; /** * A reference to the HTML element identified by `interactionTarget`. * NOTE: for attribution purpose, a selector identifying the element is * typically more useful than the element itself. However, the element is * also made available in case additional context is needed. */ interactionTargetElement: Node | undefined; /** * The time when the user first interacted during the frame where the INP * candidate interaction occurred (if more than one interaction occurred * within the frame, only the first time is reported). */ interactionTime: DOMHighResTimeStamp; /** * The best-guess timestamp of the next paint after the interaction. * In general, this timestamp is the same as the `startTime + duration` of * the event timing entry. However, since `duration` values are rounded to * the nearest 8ms, it can sometimes appear that the paint occurred before * processing ended (which cannot happen). This value clamps the paint time * so it's always after `processingEnd` from the Event Timing API and * `renderStart` from the Long Animation Frame API (where available). * It also averages the duration values for all entries in the same * animation frame, which should be closer to the "real" value. */ nextPaintTime: DOMHighResTimeStamp; /** * The type of interaction, based on the event type of the `event` entry * that corresponds to the interaction (i.e. the first `event` entry * containing an `interactionId` dispatched in a given animation frame). * For "pointerdown", "pointerup", or "click" events this will be "pointer", * and for "keydown" or "keyup" events this will be "keyboard". */ interactionType: 'pointer' | 'keyboard'; /** * An array of Event Timing entries that were processed within the same * animation frame as the INP candidate interaction. */ processedEventEntries: PerformanceEventTiming[]; /** * If the browser supports the Long Animation Frame API, this array will * include any `long-animation-frame` entries that intersect with the INP * candidate interaction's `startTime` and the `processingEnd` time of the * last event processed within that animation frame. If the browser does not * support the Long Animation Frame API or no `long-animation-frame` entries * are detect, this array will be empty. */ longAnimationFrameEntries: PerformanceLongAnimationFrameTiming[]; /** * The time from when the user interacted with the page until when the * browser was first able to start processing event listeners for that * interaction. This time captures the delay before event processing can * begin due to the main thread being busy with other work. */ inputDelay: number; /** * The time from when the first event listener started running in response to * the user interaction until when all event listener processing has finished. */ processingDuration: number; /** * The time from when the browser finished processing all event listeners for * the user interaction until the next frame is presented on the screen and * visible to the user. This time includes work on the main thread (such as * `requestAnimationFrame()` callbacks, `ResizeObserver` and * `IntersectionObserver` callbacks, and style/layout calculation) as well * as off-main-thread work (such as compositor, GPU, and raster work). */ presentationDelay: number; /** * The loading state of the document at the time when the interaction * corresponding to INP occurred (see `LoadState` for details). If the * interaction occurred while the document was loading and executing script * (e.g. usually in the `dom-interactive` phase) it can result in long delays. */ loadState: LoadState; }"><pre><span class="pl-k">interface</span> <span class="pl-smi">INPAttribution</span> <span class="pl-kos">{</span> <span class="pl-c">/**</span> <span class="pl-c"> * A selector identifying the element that the user first interacted with</span> <span class="pl-c"> * as part of the frame where the INP candidate interaction occurred.</span> <span class="pl-c"> * If this value is an empty string, that generally means the element was</span> <span class="pl-c"> * removed from the DOM after the interaction.</span> <span class="pl-c"> */</span> <span class="pl-c1">interactionTarget</span>: <span class="pl-smi">string</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * A reference to the HTML element identified by `interactionTarget`.</span> <span class="pl-c"> * NOTE: for attribution purpose, a selector identifying the element is</span> <span class="pl-c"> * typically more useful than the element itself. However, the element is</span> <span class="pl-c"> * also made available in case additional context is needed.</span> <span class="pl-c"> */</span> <span class="pl-c1">interactionTargetElement</span>: <span class="pl-smi">Node</span> <span class="pl-c1">|</span> <span class="pl-c1">undefined</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The time when the user first interacted during the frame where the INP</span> <span class="pl-c"> * candidate interaction occurred (if more than one interaction occurred</span> <span class="pl-c"> * within the frame, only the first time is reported).</span> <span class="pl-c"> */</span> <span class="pl-c1">interactionTime</span>: <span class="pl-smi">DOMHighResTimeStamp</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The best-guess timestamp of the next paint after the interaction.</span> <span class="pl-c"> * In general, this timestamp is the same as the `startTime + duration` of</span> <span class="pl-c"> * the event timing entry. However, since `duration` values are rounded to</span> <span class="pl-c"> * the nearest 8ms, it can sometimes appear that the paint occurred before</span> <span class="pl-c"> * processing ended (which cannot happen). This value clamps the paint time</span> <span class="pl-c"> * so it's always after `processingEnd` from the Event Timing API and</span> <span class="pl-c"> * `renderStart` from the Long Animation Frame API (where available).</span> <span class="pl-c"> * It also averages the duration values for all entries in the same</span> <span class="pl-c"> * animation frame, which should be closer to the "real" value.</span> <span class="pl-c"> */</span> <span class="pl-c1">nextPaintTime</span>: <span class="pl-smi">DOMHighResTimeStamp</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The type of interaction, based on the event type of the `event` entry</span> <span class="pl-c"> * that corresponds to the interaction (i.e. the first `event` entry</span> <span class="pl-c"> * containing an `interactionId` dispatched in a given animation frame).</span> <span class="pl-c"> * For "pointerdown", "pointerup", or "click" events this will be "pointer",</span> <span class="pl-c"> * and for "keydown" or "keyup" events this will be "keyboard".</span> <span class="pl-c"> */</span> <span class="pl-c1">interactionType</span>: <span class="pl-s">'pointer'</span> <span class="pl-c1">|</span> <span class="pl-s">'keyboard'</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * An array of Event Timing entries that were processed within the same</span> <span class="pl-c"> * animation frame as the INP candidate interaction.</span> <span class="pl-c"> */</span> <span class="pl-c1">processedEventEntries</span>: <span class="pl-smi">PerformanceEventTiming</span><span class="pl-kos">[</span><span class="pl-kos">]</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * If the browser supports the Long Animation Frame API, this array will</span> <span class="pl-c"> * include any `long-animation-frame` entries that intersect with the INP</span> <span class="pl-c"> * candidate interaction's `startTime` and the `processingEnd` time of the</span> <span class="pl-c"> * last event processed within that animation frame. If the browser does not</span> <span class="pl-c"> * support the Long Animation Frame API or no `long-animation-frame` entries</span> <span class="pl-c"> * are detect, this array will be empty.</span> <span class="pl-c"> */</span> <span class="pl-c1">longAnimationFrameEntries</span>: <span class="pl-smi">PerformanceLongAnimationFrameTiming</span><span class="pl-kos">[</span><span class="pl-kos">]</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The time from when the user interacted with the page until when the</span> <span class="pl-c"> * browser was first able to start processing event listeners for that</span> <span class="pl-c"> * interaction. This time captures the delay before event processing can</span> <span class="pl-c"> * begin due to the main thread being busy with other work.</span> <span class="pl-c"> */</span> <span class="pl-c1">inputDelay</span>: <span class="pl-smi">number</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The time from when the first event listener started running in response to</span> <span class="pl-c"> * the user interaction until when all event listener processing has finished.</span> <span class="pl-c"> */</span> <span class="pl-c1">processingDuration</span>: <span class="pl-smi">number</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The time from when the browser finished processing all event listeners for</span> <span class="pl-c"> * the user interaction until the next frame is presented on the screen and</span> <span class="pl-c"> * visible to the user. This time includes work on the main thread (such as</span> <span class="pl-c"> * `requestAnimationFrame()` callbacks, `ResizeObserver` and</span> <span class="pl-c"> * `IntersectionObserver` callbacks, and style/layout calculation) as well</span> <span class="pl-c"> * as off-main-thread work (such as compositor, GPU, and raster work).</span> <span class="pl-c"> */</span> <span class="pl-c1">presentationDelay</span>: <span class="pl-smi">number</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The loading state of the document at the time when the interaction</span> <span class="pl-c"> * corresponding to INP occurred (see `LoadState` for details). If the</span> <span class="pl-c"> * interaction occurred while the document was loading and executing script</span> <span class="pl-c"> * (e.g. usually in the `dom-interactive` phase) it can result in long delays.</span> <span class="pl-c"> */</span> <span class="pl-c1">loadState</span>: <span class="pl-smi">LoadState</span><span class="pl-kos">;</span> <span class="pl-kos">}</span></pre></div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto"><code>LCPAttribution</code></h4><a id="user-content-lcpattribution" class="anchor" aria-label="Permalink: LCPAttribution" href="#lcpattribution"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="interface LCPAttribution { /** * The element corresponding to the largest contentful paint for the page. */ element?: string; /** * The URL (if applicable) of the LCP image resource. If the LCP element * is a text node, this value will not be set. */ url?: string; /** * The time from when the user initiates loading the page until when the * browser receives the first byte of the response (a.k.a. TTFB). See * [Optimize LCP](https://web.dev/articles/optimize-lcp) for details. */ timeToFirstByte: number; /** * The delta between TTFB and when the browser starts loading the LCP * resource (if there is one, otherwise 0). See [Optimize * LCP](https://web.dev/articles/optimize-lcp) for details. */ resourceLoadDelay: number; /** * The total time it takes to load the LCP resource itself (if there is one, * otherwise 0). See [Optimize LCP](https://web.dev/articles/optimize-lcp) for * details. */ resourceLoadDuration: number; /** * The delta between when the LCP resource finishes loading until the LCP * element is fully rendered. See [Optimize * LCP](https://web.dev/articles/optimize-lcp) for details. */ elementRenderDelay: number; /** * The `navigation` entry of the current page, which is useful for diagnosing * general page load issues. This can be used to access `serverTiming` for example: * navigationEntry?.serverTiming */ navigationEntry?: PerformanceNavigationTiming; /** * The `resource` entry for the LCP resource (if applicable), which is useful * for diagnosing resource load issues. */ lcpResourceEntry?: PerformanceResourceTiming; /** * The `LargestContentfulPaint` entry corresponding to LCP. */ lcpEntry?: LargestContentfulPaint; }"><pre><span class="pl-k">interface</span> <span class="pl-smi">LCPAttribution</span> <span class="pl-kos">{</span> <span class="pl-c">/**</span> <span class="pl-c"> * The element corresponding to the largest contentful paint for the page.</span> <span class="pl-c"> */</span> <span class="pl-c1">element</span>?: <span class="pl-smi">string</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The URL (if applicable) of the LCP image resource. If the LCP element</span> <span class="pl-c"> * is a text node, this value will not be set.</span> <span class="pl-c"> */</span> <span class="pl-c1">url</span>?: <span class="pl-smi">string</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The time from when the user initiates loading the page until when the</span> <span class="pl-c"> * browser receives the first byte of the response (a.k.a. TTFB). See</span> <span class="pl-c"> * [Optimize LCP](https://web.dev/articles/optimize-lcp) for details.</span> <span class="pl-c"> */</span> <span class="pl-c1">timeToFirstByte</span>: <span class="pl-smi">number</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The delta between TTFB and when the browser starts loading the LCP</span> <span class="pl-c"> * resource (if there is one, otherwise 0). See [Optimize</span> <span class="pl-c"> * LCP](https://web.dev/articles/optimize-lcp) for details.</span> <span class="pl-c"> */</span> <span class="pl-c1">resourceLoadDelay</span>: <span class="pl-smi">number</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The total time it takes to load the LCP resource itself (if there is one,</span> <span class="pl-c"> * otherwise 0). See [Optimize LCP](https://web.dev/articles/optimize-lcp) for</span> <span class="pl-c"> * details.</span> <span class="pl-c"> */</span> <span class="pl-c1">resourceLoadDuration</span>: <span class="pl-smi">number</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The delta between when the LCP resource finishes loading until the LCP</span> <span class="pl-c"> * element is fully rendered. See [Optimize</span> <span class="pl-c"> * LCP](https://web.dev/articles/optimize-lcp) for details.</span> <span class="pl-c"> */</span> <span class="pl-c1">elementRenderDelay</span>: <span class="pl-smi">number</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The `navigation` entry of the current page, which is useful for diagnosing</span> <span class="pl-c"> * general page load issues. This can be used to access `serverTiming` for example:</span> <span class="pl-c"> * navigationEntry?.serverTiming</span> <span class="pl-c"> */</span> <span class="pl-c1">navigationEntry</span>?: <span class="pl-smi">PerformanceNavigationTiming</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The `resource` entry for the LCP resource (if applicable), which is useful</span> <span class="pl-c"> * for diagnosing resource load issues.</span> <span class="pl-c"> */</span> <span class="pl-c1">lcpResourceEntry</span>?: <span class="pl-smi">PerformanceResourceTiming</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The `LargestContentfulPaint` entry corresponding to LCP.</span> <span class="pl-c"> */</span> <span class="pl-c1">lcpEntry</span>?: <span class="pl-smi">LargestContentfulPaint</span><span class="pl-kos">;</span> <span class="pl-kos">}</span></pre></div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto"><code>TTFBAttribution</code></h4><a id="user-content-ttfbattribution" class="anchor" aria-label="Permalink: TTFBAttribution" href="#ttfbattribution"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-ts notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="export interface TTFBAttribution { /** * The total time from when the user initiates loading the page to when the * page starts to handle the request. Large values here are typically due * to HTTP redirects, though other browser processing contributes to this * duration as well (so even without redirect it's generally not zero). */ waitingDuration: number; /** * The total time spent checking the HTTP cache for a match. For navigations * handled via service worker, this duration usually includes service worker * start-up time as well as time processing `fetch` event listeners, with * some exceptions, see: https://github.com/w3c/navigation-timing/issues/199 */ cacheDuration: number; /** * The total time to resolve the DNS for the requested domain. */ dnsDuration: number; /** * The total time to create the connection to the requested domain. */ connectionDuration: number; /** * The total time from when the request was sent until the first byte of the * response was received. This includes network time as well as server * processing time. */ requestDuration: number; /** * The `navigation` entry of the current page, which is useful for diagnosing * general page load issues. This can be used to access `serverTiming` for * example: navigationEntry?.serverTiming */ navigationEntry?: PerformanceNavigationTiming; }"><pre><span class="pl-k">export</span> <span class="pl-k">interface</span> <span class="pl-smi">TTFBAttribution</span> <span class="pl-kos">{</span> <span class="pl-c">/**</span> <span class="pl-c"> * The total time from when the user initiates loading the page to when the</span> <span class="pl-c"> * page starts to handle the request. Large values here are typically due</span> <span class="pl-c"> * to HTTP redirects, though other browser processing contributes to this</span> <span class="pl-c"> * duration as well (so even without redirect it's generally not zero).</span> <span class="pl-c"> */</span> <span class="pl-c1">waitingDuration</span>: <span class="pl-smi">number</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The total time spent checking the HTTP cache for a match. For navigations</span> <span class="pl-c"> * handled via service worker, this duration usually includes service worker</span> <span class="pl-c"> * start-up time as well as time processing `fetch` event listeners, with</span> <span class="pl-c"> * some exceptions, see: https://github.com/w3c/navigation-timing/issues/199</span> <span class="pl-c"> */</span> <span class="pl-c1">cacheDuration</span>: <span class="pl-smi">number</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The total time to resolve the DNS for the requested domain.</span> <span class="pl-c"> */</span> <span class="pl-c1">dnsDuration</span>: <span class="pl-smi">number</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The total time to create the connection to the requested domain.</span> <span class="pl-c"> */</span> <span class="pl-c1">connectionDuration</span>: <span class="pl-smi">number</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The total time from when the request was sent until the first byte of the</span> <span class="pl-c"> * response was received. This includes network time as well as server</span> <span class="pl-c"> * processing time.</span> <span class="pl-c"> */</span> <span class="pl-c1">requestDuration</span>: <span class="pl-smi">number</span><span class="pl-kos">;</span> <span class="pl-c">/**</span> <span class="pl-c"> * The `navigation` entry of the current page, which is useful for diagnosing</span> <span class="pl-c"> * general page load issues. This can be used to access `serverTiming` for</span> <span class="pl-c"> * example: navigationEntry?.serverTiming</span> <span class="pl-c"> */</span> <span class="pl-c1">navigationEntry</span>?: <span class="pl-smi">PerformanceNavigationTiming</span><span class="pl-kos">;</span> <span class="pl-kos">}</span></pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Browser Support</h2><a id="user-content-browser-support" class="anchor" aria-label="Permalink: Browser Support" href="#browser-support"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The <code>web-vitals</code> code has been tested and will run without error in all major browsers as well as Internet Explorer back to version 9. However, some of the APIs required to capture these metrics are currently only available in Chromium-based browsers (e.g. Chrome, Edge, Opera, Samsung Internet).</p> <p dir="auto">Browser support for each function is as follows:</p> <ul dir="auto"> <li><code>onCLS()</code>: Chromium</li> <li><code>onFCP()</code>: Chromium, Firefox, Safari</li> <li><code>onFID()</code>: Chromium, Firefox <em>(Deprecated)</em></li> <li><code>onINP()</code>: Chromium</li> <li><code>onLCP()</code>: Chromium, Firefox</li> <li><code>onTTFB()</code>: Chromium, Firefox, Safari</li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Limitations</h2><a id="user-content-limitations" class="anchor" aria-label="Permalink: Limitations" href="#limitations"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The <code>web-vitals</code> library is primarily a wrapper around the Web APIs that measure the Web Vitals metrics, which means the limitations of those APIs will mostly apply to this library as well. More details on these limitations is available in <a href="https://web.dev/articles/crux-and-rum-differences" rel="nofollow">this blog post</a>.</p> <p dir="auto">The primary limitation of these APIs is they have no visibility into <code><iframe></code> content (not even same-origin iframes), which means pages that make use of iframes will likely see a difference between the data measured by this library and the data available in the Chrome User Experience Report (which does include iframe content).</p> <p dir="auto">For same-origin iframes, it's possible to use the <code>web-vitals</code> library to measure metrics, but it's tricky because it requires the developer to add the library to every frame and <code>postMessage()</code> the results to the parent frame for aggregation.</p> <div class="markdown-alert markdown-alert-note" dir="auto"><p class="markdown-alert-title" dir="auto"><svg class="octicon octicon-info mr-2" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg>Note</p><p dir="auto">Given the lack of iframe support, the <code>onCLS()</code> function technically measures <a href="https://github.com/wicg/layout-instability#cumulative-scores">DCLS</a> (Document Cumulative Layout Shift) rather than CLS, if the page includes iframes).</p> </div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Development</h2><a id="user-content-development" class="anchor" aria-label="Permalink: Development" href="#development"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Building the code</h3><a id="user-content-building-the-code" class="anchor" aria-label="Permalink: Building the code" href="#building-the-code"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The <code>web-vitals</code> source code is written in TypeScript. To transpile the code and build the production bundles, run the following command.</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="npm run build"><pre>npm run build</pre></div> <p dir="auto">To build the code and watch for changes, run:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="npm run watch"><pre>npm run watch</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Running the tests</h3><a id="user-content-running-the-tests" class="anchor" aria-label="Permalink: Running the tests" href="#running-the-tests"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The <code>web-vitals</code> code is tested in real browsers using <a href="https://webdriver.io/" rel="nofollow">webdriver.io</a>. Use the following command to run the tests:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="npm test"><pre>npm <span class="pl-c1">test</span></pre></div> <p dir="auto">To test any of the APIs manually, you can start the test server</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="npm run test:server"><pre>npm run test:server</pre></div> <p dir="auto">Then navigate to <code>http://localhost:9090/test/<view></code>, where <code><view></code> is the basename of one the templates under <a href="/GoogleChrome/web-vitals/blob/main/test/views">/test/views/</a>.</p> <p dir="auto">You'll likely want to combine this with <code>npm run watch</code> to ensure any changes you make are transpiled and rebuilt.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Integrations</h2><a id="user-content-integrations" class="anchor" aria-label="Permalink: Integrations" href="#integrations"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li><a href="https://goo.gle/web-vitals-connector" rel="nofollow"><strong>Web Vitals Connector</strong></a>: Data Studio connector to create dashboards from <a href="https://web.dev/articles/vitals-ga4" rel="nofollow">Web Vitals data captured in BiqQuery</a>.</li> <li><a href="https://www.simoahava.com/custom-templates/core-web-vitals/" rel="nofollow"><strong>Core Web Vitals Custom Tag template</strong></a>: Custom GTM template tag to <a href="https://www.simoahava.com/analytics/track-core-web-vitals-in-ga4-with-google-tag-manager/" rel="nofollow">add measurement handlers</a> for all Core Web Vitals metrics.</li> <li><a href="https://github.com/treosh/web-vitals-reporter"><strong><code>web-vitals-reporter</code></strong></a>: JavaScript library to batch <code>callback</code> functions and send data with a single request.</li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">License</h2><a id="user-content-license" class="anchor" aria-label="Permalink: License" href="#license"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><a href="/GoogleChrome/web-vitals/blob/main/LICENSE">Apache 2.0</a></p> </article></div></div></div></div></div> <!-- --> <!-- --> <script type="application/json" id="__PRIMER_DATA_:R0:__">{"resolvedServerColorMode":"day"}</script></div> </react-partial> <input type="hidden" data-csrf="true" value="dyJgut7VNqIFm/9IiyFfOUmt7RaDLVr3T8J3bz91Yu7x5snugkUtYqgez2tCAMYB1DYQ7UwWQbScRwsV/2K9bQ==" /> </div> <div data-view-component="true" class="Layout-sidebar"> <div class="BorderGrid about-margin" data-pjax> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <div class="hide-sm hide-md"> <h2 class="mb-3 h4">About</h2> <p class="f4 my-3"> Essential metrics for a healthy site. </p> <div class="my-3 d-flex flex-items-center"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-link flex-shrink-0 mr-2"> <path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path> </svg> <span class="flex-auto min-width-0 css-truncate css-truncate-target width-fit"> <a title="https://web.dev/vitals" role="link" target="_blank" rel="noopener noreferrer nofollow" class="text-bold" href="https://web.dev/vitals">web.dev/vitals</a> </span> </div> <h3 class="sr-only">Resources</h3> <div class="mt-2"> <a class="Link--muted" data-analytics-event="{"category":"Repository Overview","action":"click","label":"location:sidebar;file:readme"}" href="#readme-ov-file"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-book mr-2"> <path d="M0 1.75A.75.75 0 0 1 .75 1h4.253c1.227 0 2.317.59 3 1.501A3.743 3.743 0 0 1 11.006 1h4.245a.75.75 0 0 1 .75.75v10.5a.75.75 0 0 1-.75.75h-4.507a2.25 2.25 0 0 0-1.591.659l-.622.621a.75.75 0 0 1-1.06 0l-.622-.621A2.25 2.25 0 0 0 5.258 13H.75a.75.75 0 0 1-.75-.75Zm7.251 10.324.004-5.073-.002-2.253A2.25 2.25 0 0 0 5.003 2.5H1.5v9h3.757a3.75 3.75 0 0 1 1.994.574ZM8.755 4.75l-.004 7.322a3.752 3.752 0 0 1 1.992-.572H14.5v-9h-3.495a2.25 2.25 0 0 0-2.25 2.25Z"></path> </svg> Readme </a> </div> <h3 class="sr-only">License</h3> <div class="mt-2"> <a href="#Apache-2.0-1-ov-file" class="Link--muted" data-analytics-event="{"category":"Repository Overview","action":"click","label":"location:sidebar;file:license"}" > <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-law mr-2"> <path d="M8.75.75V2h.985c.304 0 .603.08.867.231l1.29.736c.038.022.08.033.124.033h2.234a.75.75 0 0 1 0 1.5h-.427l2.111 4.692a.75.75 0 0 1-.154.838l-.53-.53.529.531-.001.002-.002.002-.006.006-.006.005-.01.01-.045.04c-.21.176-.441.327-.686.45C14.556 10.78 13.88 11 13 11a4.498 4.498 0 0 1-2.023-.454 3.544 3.544 0 0 1-.686-.45l-.045-.04-.016-.015-.006-.006-.004-.004v-.001a.75.75 0 0 1-.154-.838L12.178 4.5h-.162c-.305 0-.604-.079-.868-.231l-1.29-.736a.245.245 0 0 0-.124-.033H8.75V13h2.5a.75.75 0 0 1 0 1.5h-6.5a.75.75 0 0 1 0-1.5h2.5V3.5h-.984a.245.245 0 0 0-.124.033l-1.289.737c-.265.15-.564.23-.869.23h-.162l2.112 4.692a.75.75 0 0 1-.154.838l-.53-.53.529.531-.001.002-.002.002-.006.006-.016.015-.045.04c-.21.176-.441.327-.686.45C4.556 10.78 3.88 11 3 11a4.498 4.498 0 0 1-2.023-.454 3.544 3.544 0 0 1-.686-.45l-.045-.04-.016-.015-.006-.006-.004-.004v-.001a.75.75 0 0 1-.154-.838L2.178 4.5H1.75a.75.75 0 0 1 0-1.5h2.234a.249.249 0 0 0 .125-.033l1.288-.737c.265-.15.564-.23.869-.23h.984V.75a.75.75 0 0 1 1.5 0Zm2.945 8.477c.285.135.718.273 1.305.273s1.02-.138 1.305-.273L13 6.327Zm-10 0c.285.135.718.273 1.305.273s1.02-.138 1.305-.273L3 6.327Z"></path> </svg> Apache-2.0 license </a> </div> <h3 class="sr-only">Code of conduct</h3> <div class="mt-2"> <a href="#coc-ov-file" class="Link--muted" data-analytics-event="{"category":"Repository Overview","action":"click","label":"location:sidebar;file:code of conduct"}" > <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-code-of-conduct mr-2"> <path d="M8.048 2.241c.964-.709 2.079-1.238 3.325-1.241a4.616 4.616 0 0 1 3.282 1.355c.41.408.757.86.996 1.428.238.568.348 1.206.347 1.968 0 2.193-1.505 4.254-3.081 5.862-1.496 1.526-3.213 2.796-4.249 3.563l-.22.163a.749.749 0 0 1-.895 0l-.221-.163c-1.036-.767-2.753-2.037-4.249-3.563C1.51 10.008.007 7.952.002 5.762a4.614 4.614 0 0 1 1.353-3.407C3.123.585 6.223.537 8.048 2.24Zm-1.153.983c-1.25-1.033-3.321-.967-4.48.191a3.115 3.115 0 0 0-.913 2.335c0 1.556 1.109 3.24 2.652 4.813C5.463 11.898 6.96 13.032 8 13.805c.353-.262.758-.565 1.191-.905l-1.326-1.223a.75.75 0 0 1 1.018-1.102l1.48 1.366c.328-.281.659-.577.984-.887L9.99 9.802a.75.75 0 1 1 1.019-1.103l1.384 1.28c.295-.329.566-.661.81-.995L12.92 8.7l-1.167-1.168c-.674-.671-1.78-.664-2.474.03-.268.269-.538.537-.802.797-.893.882-2.319.843-3.185-.032-.346-.35-.693-.697-1.043-1.047a.75.75 0 0 1-.04-1.016c.162-.191.336-.401.52-.623.62-.748 1.356-1.637 2.166-2.417Zm7.112 4.442c.313-.65.491-1.293.491-1.916v-.001c0-.614-.088-1.045-.23-1.385-.143-.339-.357-.633-.673-.949a3.111 3.111 0 0 0-2.218-.915c-1.092.003-2.165.627-3.226 1.602-.823.755-1.554 1.637-2.228 2.45l-.127.154.562.566a.755.755 0 0 0 1.066.02l.794-.79c1.258-1.258 3.312-1.31 4.594-.032.396.394.792.791 1.173 1.173Z"></path> </svg> Code of conduct </a> </div> <include-fragment src="/GoogleChrome/web-vitals/hovercards/citation/sidebar_partial?tree_name=main"> </include-fragment> <div class="mt-2"> <a href="/GoogleChrome/web-vitals/activity" data-view-component="true" class="Link Link--muted"> <svg text="gray" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-pulse mr-2"> <path d="M6 2c.306 0 .582.187.696.471L10 10.731l1.304-3.26A.751.751 0 0 1 12 7h3.25a.75.75 0 0 1 0 1.5h-2.742l-1.812 4.528a.751.751 0 0 1-1.392 0L6 4.77 4.696 8.03A.75.75 0 0 1 4 8.5H.75a.75.75 0 0 1 0-1.5h2.742l1.812-4.529A.751.751 0 0 1 6 2Z"></path> </svg> <span class="color-fg-muted">Activity</span> </a> </div> <div class="mt-2"> <a href="/GoogleChrome/web-vitals/custom-properties" data-view-component="true" class="Link Link--muted"> <svg text="gray" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-note mr-2"> <path d="M0 3.75C0 2.784.784 2 1.75 2h12.5c.966 0 1.75.784 1.75 1.75v8.5A1.75 1.75 0 0 1 14.25 14H1.75A1.75 1.75 0 0 1 0 12.25Zm1.75-.25a.25.25 0 0 0-.25.25v8.5c0 .138.112.25.25.25h12.5a.25.25 0 0 0 .25-.25v-8.5a.25.25 0 0 0-.25-.25ZM3.5 6.25a.75.75 0 0 1 .75-.75h7a.75.75 0 0 1 0 1.5h-7a.75.75 0 0 1-.75-.75Zm.75 2.25h4a.75.75 0 0 1 0 1.5h-4a.75.75 0 0 1 0-1.5Z"></path> </svg> <span class="color-fg-muted">Custom properties</span> </a> </div> <h3 class="sr-only">Stars</h3> <div class="mt-2"> <a href="/GoogleChrome/web-vitals/stargazers" data-view-component="true" class="Link Link--muted"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-star mr-2"> <path d="M8 .25a.75.75 0 0 1 .673.418l1.882 3.815 4.21.612a.75.75 0 0 1 .416 1.279l-3.046 2.97.719 4.192a.751.751 0 0 1-1.088.791L8 12.347l-3.766 1.98a.75.75 0 0 1-1.088-.79l.72-4.194L.818 6.374a.75.75 0 0 1 .416-1.28l4.21-.611L7.327.668A.75.75 0 0 1 8 .25Zm0 2.445L6.615 5.5a.75.75 0 0 1-.564.41l-3.097.45 2.24 2.184a.75.75 0 0 1 .216.664l-.528 3.084 2.769-1.456a.75.75 0 0 1 .698 0l2.77 1.456-.53-3.084a.75.75 0 0 1 .216-.664l2.24-2.183-3.096-.45a.75.75 0 0 1-.564-.41L8 2.694Z"></path> </svg> <strong>7.6k</strong> stars </a> </div> <h3 class="sr-only">Watchers</h3> <div class="mt-2"> <a href="/GoogleChrome/web-vitals/watchers" data-view-component="true" class="Link Link--muted"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-eye mr-2"> <path d="M8 2c1.981 0 3.671.992 4.933 2.078 1.27 1.091 2.187 2.345 2.637 3.023a1.62 1.62 0 0 1 0 1.798c-.45.678-1.367 1.932-2.637 3.023C11.67 13.008 9.981 14 8 14c-1.981 0-3.671-.992-4.933-2.078C1.797 10.83.88 9.576.43 8.898a1.62 1.62 0 0 1 0-1.798c.45-.677 1.367-1.931 2.637-3.022C4.33 2.992 6.019 2 8 2ZM1.679 7.932a.12.12 0 0 0 0 .136c.411.622 1.241 1.75 2.366 2.717C5.176 11.758 6.527 12.5 8 12.5c1.473 0 2.825-.742 3.955-1.715 1.124-.967 1.954-2.096 2.366-2.717a.12.12 0 0 0 0-.136c-.412-.621-1.242-1.75-2.366-2.717C10.824 4.242 9.473 3.5 8 3.5c-1.473 0-2.825.742-3.955 1.715-1.124.967-1.954 2.096-2.366 2.717ZM8 10a2 2 0 1 1-.001-3.999A2 2 0 0 1 8 10Z"></path> </svg> <strong>116</strong> watching </a> </div> <h3 class="sr-only">Forks</h3> <div class="mt-2"> <a href="/GoogleChrome/web-vitals/forks" data-view-component="true" class="Link Link--muted"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-repo-forked mr-2"> <path d="M5 5.372v.878c0 .414.336.75.75.75h4.5a.75.75 0 0 0 .75-.75v-.878a2.25 2.25 0 1 1 1.5 0v.878a2.25 2.25 0 0 1-2.25 2.25h-1.5v2.128a2.251 2.251 0 1 1-1.5 0V8.5h-1.5A2.25 2.25 0 0 1 3.5 6.25v-.878a2.25 2.25 0 1 1 1.5 0ZM5 3.25a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Zm6.75.75a.75.75 0 1 0 0-1.5.75.75 0 0 0 0 1.5Zm-3 8.75a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Z"></path> </svg> <strong>418</strong> forks </a> </div> <div class="mt-2"> <a class="Link--muted" href="/contact/report-content?content_url=https%3A%2F%2Fgithub.com%2FGoogleChrome%2Fweb-vitals&report=GoogleChrome+%28user%29"> Report repository </a> </div> </div> </div> </div> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <h2 class="h4 mb-3" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame"> <a href="/GoogleChrome/web-vitals/releases" data-view-component="true" class="Link--primary no-underline Link"> Releases </a></h2> <a class="Link--primary no-underline" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame" href="/GoogleChrome/web-vitals/tags"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-tag"> <path d="M1 7.775V2.75C1 1.784 1.784 1 2.75 1h5.025c.464 0 .91.184 1.238.513l6.25 6.25a1.75 1.75 0 0 1 0 2.474l-5.026 5.026a1.75 1.75 0 0 1-2.474 0l-6.25-6.25A1.752 1.752 0 0 1 1 7.775Zm1.5 0c0 .066.026.13.073.177l6.25 6.25a.25.25 0 0 0 .354 0l5.025-5.025a.25.25 0 0 0 0-.354l-6.25-6.25a.25.25 0 0 0-.177-.073H2.75a.25.25 0 0 0-.25.25ZM6 5a1 1 0 1 1 0 2 1 1 0 0 1 0-2Z"></path> </svg> <span class="text-bold">54</span> <span class="color-fg-muted">tags</span> </a> </div> </div> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <h2 class="h4 mb-3"> <a href="/orgs/GoogleChrome/packages?repo_name=web-vitals" data-view-component="true" class="Link--primary no-underline Link d-flex flex-items-center"> Packages <span title="0" hidden="hidden" data-view-component="true" class="Counter ml-1">0</span> </a></h2> <div class="text-small color-fg-muted" > No packages published <br> </div> </div> </div> <div class="BorderGrid-row" > <div class="BorderGrid-cell"> <h2 class="h4 mb-3"> <a href="/GoogleChrome/web-vitals/network/dependents" data-view-component="true" class="Link--primary no-underline Link"> Used by <span title="9,426,603" data-view-component="true" class="Counter">9.4m</span> </a> </h2> <a class="d-flex flex-items-center" href="/GoogleChrome/web-vitals/network/dependents"> <ul class="hx_flex-avatar-stack list-style-none min-width-0"> <li class="hx_flex-avatar-stack-item"> <img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/98684978?s=64&v=4" width="32" height="32" alt="@songtoantd18" /> </li> <li class="hx_flex-avatar-stack-item"> <img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/157714365?s=64&v=4" width="32" height="32" alt="@Kapil-Vishwakarma25" /> </li> <li class="hx_flex-avatar-stack-item"> <img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/138091561?s=64&v=4" width="32" height="32" alt="@2blackcow" /> </li> <li class="hx_flex-avatar-stack-item"> <img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/182499532?s=64&v=4" width="32" height="32" alt="@vishnu-prasath-M" /> </li> <li class="hx_flex-avatar-stack-item"> <img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/142559366?s=64&v=4" width="32" height="32" alt="@ryash2166" /> </li> <li class="hx_flex-avatar-stack-item"> <img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/122015834?s=64&v=4" width="32" height="32" alt="@saranyat2022" /> </li> <li class="hx_flex-avatar-stack-item"> <img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/127102691?s=64&v=4" width="32" height="32" alt="@aloksamyotech" /> </li> <li class="hx_flex-avatar-stack-item"> <img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/75109971?s=64&v=4" width="32" height="32" alt="@songa123156" /> </li> </ul> <span class="px-2 text-bold text-small no-wrap"> + 9,426,595 </span> </a> </div> </div> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <h2 class="h4 mb-3"> <a href="/GoogleChrome/web-vitals/graphs/contributors" data-view-component="true" class="Link--primary no-underline Link d-flex flex-items-center"> Contributors <span title="31" data-view-component="true" class="Counter ml-1">31</span> </a></h2> <ul class="list-style-none d-flex flex-wrap mb-n2"> <li class="mb-2 mr-2" > <a href="https://github.com/philipwalton" class="" data-hovercard-type="user" data-hovercard-url="/users/philipwalton/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/326742?s=64&v=4" alt="@philipwalton" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/tunetheweb" class="" data-hovercard-type="user" data-hovercard-url="/users/tunetheweb/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/10931297?s=64&v=4" alt="@tunetheweb" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/apps/dependabot" class="" > <img src="https://avatars.githubusercontent.com/in/29110?s=64&v=4" alt="@dependabot[bot]" size="32" height="32" width="32" data-view-component="true" class="avatar" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/brendankenny" class="" data-hovercard-type="user" data-hovercard-url="/users/brendankenny/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/316891?s=64&v=4" alt="@brendankenny" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/omrilotan" class="" data-hovercard-type="user" data-hovercard-url="/users/omrilotan/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/516342?s=64&v=4" alt="@omrilotan" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/Zizzamia" class="" data-hovercard-type="user" data-hovercard-url="/users/Zizzamia/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/829214?s=64&v=4" alt="@Zizzamia" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/stephenyu" class="" data-hovercard-type="user" data-hovercard-url="/users/stephenyu/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/959786?s=64&v=4" alt="@stephenyu" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/SimenHansen" class="" data-hovercard-type="user" data-hovercard-url="/users/SimenHansen/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/3629563?s=64&v=4" alt="@SimenHansen" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/ben-larson" class="" data-hovercard-type="user" data-hovercard-url="/users/ben-larson/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/10101828?s=64&v=4" alt="@ben-larson" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/robatron" class="" data-hovercard-type="user" data-hovercard-url="/users/robatron/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/127095?s=64&v=4" alt="@robatron" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/rviscomi" class="" data-hovercard-type="user" data-hovercard-url="/users/rviscomi/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/1120896?s=64&v=4" alt="@rviscomi" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/malchata" class="" data-hovercard-type="user" data-hovercard-url="/users/malchata/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/1635238?s=64&v=4" alt="@malchata" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/justin-john" class="" data-hovercard-type="user" data-hovercard-url="/users/justin-john/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/2345128?s=64&v=4" alt="@justin-john" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> <li class="mb-2 mr-2" > <a href="https://github.com/roderickhsiao" class="" data-hovercard-type="user" data-hovercard-url="/users/roderickhsiao/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" > <img src="https://avatars.githubusercontent.com/u/3906130?s=64&v=4" alt="@roderickhsiao" size="32" height="32" width="32" data-view-component="true" class="avatar circle" /> </a> </li> </ul> <div data-view-component="true" class="mt-3"> <a text="small" href="/GoogleChrome/web-vitals/graphs/contributors" data-view-component="true" class="Link--inTextBlock Link"> + 17 contributors </a></div> </div> </div> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <h2 class="h4 mb-3">Languages</h2> <div class="mb-2"> <span data-view-component="true" class="Progress"> <span style="background-color:#f1e05a !important;;width: 50.7%;" itemprop="keywords" aria-label="JavaScript 50.7" data-view-component="true" class="Progress-item color-bg-success-emphasis"></span> <span style="background-color:#3178c6 !important;;width: 41.9%;" itemprop="keywords" aria-label="TypeScript 41.9" data-view-component="true" class="Progress-item 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mr-1">JavaScript</span> <span>50.7%</span> </a> </li> <li class="d-inline"> <a class="d-inline-flex flex-items-center flex-nowrap Link--secondary no-underline text-small mr-3" href="/GoogleChrome/web-vitals/search?l=typescript" data-ga-click="Repository, language stats search click, location:repo overview"> <svg style="color:#3178c6;" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-dot-fill mr-2"> <path d="M8 4a4 4 0 1 1 0 8 4 4 0 0 1 0-8Z"></path> </svg> <span class="color-fg-default text-bold mr-1">TypeScript</span> <span>41.9%</span> </a> </li> <li class="d-inline"> <a class="d-inline-flex flex-items-center flex-nowrap Link--secondary no-underline text-small mr-3" href="/GoogleChrome/web-vitals/search?l=nunjucks" data-ga-click="Repository, language stats search click, location:repo overview"> <svg style="color:#3d8137;" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" 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