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class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Product <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 d-lg-flex flex-wrap dropdown-menu-wide"> <div class="HeaderMenu-column px-lg-4 border-lg-right mb-4 mb-lg-0 pr-lg-7"> <div class="border-bottom pb-3 pb-lg-0 border-lg-bottom-0"> <ul class="list-style-none f5" > <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":"github_copilot","context":"product","tag":"link","label":"github_copilot_link_product_navbar"}" href="https://github.com/features/copilot"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-copilot color-fg-subtle mr-3"> <path d="M23.922 16.992c-.861 1.495-5.859 5.023-11.922 5.023-6.063 0-11.061-3.528-11.922-5.023A.641.641 0 0 1 0 16.736v-2.869a.841.841 0 0 1 .053-.22c.372-.935 1.347-2.292 2.605-2.656.167-.429.414-1.055.644-1.517a10.195 10.195 0 0 1-.052-1.086c0-1.331.282-2.499 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 octicon-shield-check color-fg-subtle mr-3"> <path d="M16.53 9.78a.75.75 0 0 0-1.06-1.06L11 13.19l-1.97-1.97a.75.75 0 0 0-1.06 1.06l2.5 2.5a.75.75 0 0 0 1.06 0l5-5Z"></path><path d="m12.54.637 8.25 2.675A1.75 1.75 0 0 1 22 4.976V10c0 6.19-3.771 10.704-9.401 12.83a1.704 1.704 0 0 1-1.198 0C5.77 20.705 2 16.19 2 10V4.976c0-.758.489-1.43 1.21-1.664L11.46.637a1.748 1.748 0 0 1 1.08 0Zm-.617 1.426-8.25 2.676a.249.249 0 0 0-.173.237V10c0 5.46 3.28 9.483 8.43 11.426a.199.199 0 0 0 .14 0C17.22 19.483 20.5 15.461 20.5 10V4.976a.25.25 0 0 0-.173-.237l-8.25-2.676a.253.253 0 0 0-.154 0Z"></path> </svg> <div> <div class="color-fg-default h4">Security</div> Find and fix vulnerabilities </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":"actions","context":"product","tag":"link","label":"actions_link_product_navbar"}" href="https://github.com/features/actions"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-workflow 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class="octicon octicon-codespaces color-fg-subtle mr-3"> <path d="M3.5 3.75C3.5 2.784 4.284 2 5.25 2h13.5c.966 0 1.75.784 1.75 1.75v7.5A1.75 1.75 0 0 1 18.75 13H5.25a1.75 1.75 0 0 1-1.75-1.75Zm-2 12c0-.966.784-1.75 1.75-1.75h17.5c.966 0 1.75.784 1.75 1.75v4a1.75 1.75 0 0 1-1.75 1.75H3.25a1.75 1.75 0 0 1-1.75-1.75ZM5.25 3.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h13.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Zm-2 12a.25.25 0 0 0-.25.25v4c0 .138.112.25.25.25h17.5a.25.25 0 0 0 .25-.25v-4a.25.25 0 0 0-.25-.25Z"></path><path d="M10 17.75a.75.75 0 0 1 .75-.75h6.5a.75.75 0 0 1 0 1.5h-6.5a.75.75 0 0 1-.75-.75Zm-4 0a.75.75 0 0 1 .75-.75h.5a.75.75 0 0 1 0 1.5h-.5a.75.75 0 0 1-.75-.75Z"></path> </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" 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href="https://github.com/features/code-review"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-code-review color-fg-subtle mr-3"> <path d="M10.3 6.74a.75.75 0 0 1-.04 1.06l-2.908 2.7 2.908 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="M1.5 4.25c0-.966.784-1.75 1.75-1.75h17.5c.966 0 1.75.784 1.75 1.75v12.5a1.75 1.75 0 0 1-1.75 1.75h-9.69l-3.573 3.573A1.458 1.458 0 0 1 5 21.043V18.5H3.25a1.75 1.75 0 0 1-1.75-1.75ZM3.25 4a.25.25 0 0 0-.25.25v12.5c0 .138.112.25.25.25h2.5a.75.75 0 0 1 .75.75v3.19l3.72-3.72a.749.749 0 0 1 .53-.22h10a.25.25 0 0 0 .25-.25V4.25a.25.25 0 0 0-.25-.25Z"></path> </svg> <div> <div class="color-fg-default h4">Code Review</div> Manage code changes </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block 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20H10.75A1.75 1.75 0 0 1 9 18.25v-1.465a.75.75 0 0 1 1.5 0v1.465c0 .138.112.25.25.25h5.5a.75.75 0 0 1 .53.22l2.72 2.72v-2.19a.75.75 0 0 1 .75-.75h2a.25.25 0 0 0 .25-.25v-9.5Z"></path> </svg> <div> <div class="color-fg-default h4">Discussions</div> Collaborate outside of code </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" data-analytics-event="{"location":"navbar","action":"code_search","context":"product","tag":"link","label":"code_search_link_product_navbar"}" href="https://github.com/features/code-search"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" 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"> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{"location":"navbar","action":"all_features","context":"product","tag":"link","label":"all_features_link_product_navbar"}" href="https://github.com/features"> 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Overlay--size-medium Overlay--motion-scaleFade Overlay--disableScroll"> <div data-view-component="true" class="Overlay-header Overlay-header--divided"> <div class="Overlay-headerContentWrap"> <div class="Overlay-titleWrap"> <h1 class="Overlay-title " id="custom-scopes-dialog-title"> Saved searches </h1> <h2 id="custom-scopes-dialog-description" class="Overlay-description">Use saved searches to filter your results more quickly</h2> </div> <div class="Overlay-actionWrap"> <button data-close-dialog-id="custom-scopes-dialog" aria-label="Close" type="button" data-view-component="true" class="close-button Overlay-closeButton"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x"> <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 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src="/search/custom_scopes/check_name" required only-validate-on-blur="false"> <input type="text" name="custom_scope_name" id="custom_scope_name" data-target="custom-scopes.customScopesNameField" class="form-control" autocomplete="off" placeholder="github-ruby" required maxlength="50"> <input type="hidden" data-csrf="true" value="gDNkSLT8AKaYFkPKGbYoGdvdaul35Uic5TKUaNkPnoVizZ26OPTCzmuiijw2gTJw7rve9INh1Kmc71xy5YAG1g==" /> </auto-check> </div> <div class="form-group"> <label for="custom_scope_query">Query</label> <input type="text" name="custom_scope_query" id="custom_scope_query" data-target="custom-scopes.customScopesQueryField" class="form-control" autocomplete="off" placeholder="(repo:mona/a OR repo:mona/b) AND lang:python" required maxlength="500"> </div> <p class="text-small color-fg-muted"> To see all available qualifiers, see our <a class="Link--inTextBlock" href="https://docs.github.com/search-github/github-code-search/understanding-github-code-search-syntax">documentation</a>. 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border border-lg-0 rounded rounded-lg-0 px-2 py-1" style="margin-left: 12px;" data-hydro-click="{"event_type":"authentication.click","payload":{"location_in_page":"site header menu","repository_id":null,"auth_type":"SIGN_UP","originating_url":"https://github.com/whatwg/meta/blob/main/CONTRIBUTING.md","user_id":null}}" data-hydro-click-hmac="fa36f14d781bb58beb6f51449bbfdbadd051228aa2e12123c4c99f2ea8e5fb34" data-analytics-event="{"category":"Marketing nav","action":"click to go to homepage","label":"ref_page:Marketing;ref_cta:Sign in;ref_loc:Header"}" > Sign in </a> </div> <a href="/signup?ref_cta=Sign+up&ref_loc=header+logged+out&ref_page=%2F%3Cuser-name%3E%2F%3Crepo-name%3E%2Fblob%2Fshow&source=header-repo&source_repo=whatwg%2Fmeta" class="HeaderMenu-link HeaderMenu-link--sign-up HeaderMenu-button flex-shrink-0 d-flex d-lg-inline-flex no-underline border color-border-default rounded px-2 py-1" data-hydro-click="{"event_type":"authentication.click","payload":{"location_in_page":"site header menu","repository_id":null,"auth_type":"SIGN_UP","originating_url":"https://github.com/whatwg/meta/blob/main/CONTRIBUTING.md","user_id":null}}" data-hydro-click-hmac="fa36f14d781bb58beb6f51449bbfdbadd051228aa2e12123c4c99f2ea8e5fb34" data-analytics-event="{"category":"Sign up","action":"click to sign up for account","label":"ref_page:/<user-name>/<repo-name>/blob/show;ref_cta:Sign up;ref_loc:header logged out"}" > Sign up </a> <button type="button" class="sr-only js-header-menu-focus-trap d-block d-lg-none">Reseting focus</button> </div> </div> </div> </div> </header> <div hidden="hidden" data-view-component="true" class="js-stale-session-flash stale-session-flash flash flash-warn flash-full"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-alert"> <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 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aria-label="Dismiss this message"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x"> <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path> </svg> </button> <div aria-atomic="true" role="alert" class="js-flash-alert"> <div>{{ message }}</div> </div> </div> </div> </template> </div> <div class="application-main " data-commit-hovercards-enabled data-discussion-hovercards-enabled data-issue-and-pr-hovercards-enabled data-project-hovercards-enabled > <div itemscope itemtype="http://schema.org/SoftwareSourceCode" class=""> <main id="js-repo-pjax-container" > <div id="repository-container-header" class="pt-3 hide-full-screen" style="background-color: var(--page-header-bgColor, 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impact"}],"lineInfo":{"truncatedLoc":"79","truncatedSloc":"45"},"mode":"file"},"image":false,"isCodeownersFile":null,"isPlain":false,"isValidLegacyIssueTemplate":false,"issueTemplate":null,"discussionTemplate":null,"language":"Markdown","languageID":222,"large":false,"planSupportInfo":{"repoIsFork":null,"repoOwnedByCurrentUser":null,"requestFullPath":"/whatwg/meta/blob/main/CONTRIBUTING.md","showFreeOrgGatedFeatureMessage":null,"showPlanSupportBanner":null,"upgradeDataAttributes":null,"upgradePath":null},"publishBannersInfo":{"dismissActionNoticePath":"/settings/dismiss-notice/publish_action_from_dockerfile","releasePath":"/whatwg/meta/releases/new?marketplace=true","showPublishActionBanner":false},"rawBlobUrl":"https://github.com/whatwg/meta/raw/refs/heads/main/CONTRIBUTING.md","renderImageOrRaw":false,"richText":"\u003carticle class=\"markdown-body entry-content container-lg\" itemprop=\"text\"\u003e\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eContributor Guidelines\u003c/h1\u003e\u003ca id=\"user-content-contributor-guidelines\" class=\"anchor\" aria-label=\"Permalink: Contributor Guidelines\" href=\"#contributor-guidelines\"\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\"\u003eThese are the general guidelines for contributing to WHATWG standards.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eNew issues\u003c/h2\u003e\u003ca id=\"user-content-new-issues\" class=\"anchor\" aria-label=\"Permalink: New issues\" href=\"#new-issues\"\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\"\u003ePlease do file these, they are appreciated! Consider reading the \u003ca href=\"https://whatwg.org/faq\" rel=\"nofollow\"\u003eFAQ\u003c/a\u003e and \u003ca href=\"https://whatwg.org/working-mode\" rel=\"nofollow\"\u003eWorking Mode\u003c/a\u003e if you are new to standardization.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eParticipation agreement\u003c/h2\u003e\u003ca id=\"user-content-participation-agreement\" class=\"anchor\" aria-label=\"Permalink: Participation agreement\" href=\"#participation-agreement\"\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\"\u003ePlease ensure you, or your employer if you work in the field of web technologies, can sign the \u003ca href=\"https://participate.whatwg.org/agreement\" rel=\"nofollow\"\u003eContributor and Workstream Participant Agreement\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf this is your first time contributing to the WHATWG standards, check out the global list of \u003ca href=\"https://github.com/search?q=is%3Aopen+label%3A%22good+first+issue%22+user%3Awhatwg\u0026amp;type=Issues\"\u003egood first issues\u003c/a\u003e and find one you want to work on. You should comment in the thread to let others know you will be working on the issue. This is a great time to ask any questions that you may have.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eContributions to older issues are always appreciated. If an issue hasn't been updated in a while, you should ask if the issue is still relevant before working on it. If someone else was previously working on an issue, and you want to work on it, it's polite to ask that person if you can work on the issue before taking it.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCommitting\u003c/h2\u003e\u003ca id=\"user-content-committing\" class=\"anchor\" aria-label=\"Permalink: Committing\" href=\"#committing\"\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\"\u003eSee \u003ca href=\"/whatwg/meta/blob/main/COMMITTING.md\"\u003eCOMMITTING.md\u003c/a\u003e for further details.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ePull requests\u003c/h2\u003e\u003ca id=\"user-content-pull-requests\" class=\"anchor\" aria-label=\"Permalink: Pull requests\" href=\"#pull-requests\"\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\"\u003eLeave the \u003cstrong\u003eAllow edits from maintainers\u003c/strong\u003e option enabled to allow reviewers to fix trivial issues directly on your branch rather than needing to write review comments asking you make the edits. For more details, see \u003ca href=\"https://github.com/blog/2247-improving-collaboration-with-forks\"\u003eImproving collaboration with forks\u003c/a\u003e in the GitHub Blog.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAfter you have created a pull request, HTML and HTML diff output will be generated, and a bot will take care of linking those from your pull request comment (typically within several minutes). These are useful for review and implementing from the standard with the proposed change incorporated.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBuilding\u003c/h2\u003e\u003ca id=\"user-content-building\" class=\"anchor\" aria-label=\"Permalink: Building\" href=\"#building\"\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 WHATWG standards, apart from HTML, have a \u003ccode\u003eMakefile\u003c/code\u003e in their repository to help with building them. You'll need \u003ccode\u003emake\u003c/code\u003e and \u003ca href=\"https://curl.haxx.se/\" rel=\"nofollow\"\u003e\u003ccode\u003ecurl\u003c/code\u003e\u003c/a\u003e installed at the minimum; ideally you'll also have a full Bash shell. These prerequisites should be present on most Linux and macOS systems already. For Windows, we recommend \u003ca href=\"https://gitforwindows.org/\" rel=\"nofollow\"\u003eGit Bash\u003c/a\u003e and \u003ca href=\"http://gnuwin32.sourceforge.net/packages/make.htm\" rel=\"nofollow\"\u003eMake for Windows\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eOnce you have the prerequisites, you can run \u003ccode\u003emake\u003c/code\u003e in the standard's directory to build the spec; it will appear as a \u003ccode\u003e.html\u003c/code\u003e file in the same directory. This will call out to a web service to build the standard, so be sure you're connected to the internet.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eOther Make targets are also available:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ccode\u003emake deploy\u003c/code\u003e will do a full \"deploy\" of the standard, including error checking, commit snapshot production, any extra build steps, into a local subdirectory.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003emake local\u003c/code\u003e will do a local build, without calling out to any web services. This requires having \u003ca href=\"https://github.com/tabatkins/bikeshed\"\u003eBikeshed\u003c/a\u003e installed locally.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eDue to its large size, the HTML Standard has its own build process, which you can read about in the \u003ca href=\"https://github.com/whatwg/html-build/blob/main/README.md\"\u003ehtml-build repository\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eTests\u003c/h2\u003e\u003ca id=\"user-content-tests\" class=\"anchor\" aria-label=\"Permalink: Tests\" href=\"#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\"\u003eFor normative changes, a corresponding \u003ca href=\"https://github.com/w3c/web-platform-tests\"\u003eweb-platform-tests\u003c/a\u003e pull request (PR) is needed. The author and reviewer can be different from the PR for the standard. If current behavior is unclear, writing tests first can help inform the discussion. Typically, both PRs will be merged at the same time.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo be clear, a test PR with changes that conflict with the standard cannot land before the corresponding standard is changed.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf testing is not practical, please explain why and if appropriate \u003ca href=\"https://github.com/w3c/web-platform-tests/issues/new\"\u003efile an issue\u003c/a\u003e to follow up later.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eInvestigation\u003c/h2\u003e\u003ca id=\"user-content-investigation\" class=\"anchor\" aria-label=\"Permalink: Investigation\" href=\"#investigation\"\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\"\u003eOften in the course of discussing a potential change, issue with a standard, or browser bug, it's useful to investigate the behavior in question in a variety of rendering engines and provide data back to the discussion. The best way to do this is to host a small test case and report the results in various engines.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFor simple cases (not involving multiple files), sites like \u003ca href=\"https://software.hixie.ch/utilities/js/live-dom-viewer/\" rel=\"nofollow\"\u003eLive DOM Viewer\u003c/a\u003e or \u003ca href=\"https://jsbin.com/\" rel=\"nofollow\"\u003eJSBin\u003c/a\u003e are recommended. For cases involving multiple files, you'll likely need to use your own hosting, for example using \u003ca href=\"https://pages.github.com/\"\u003eGitHub Pages\u003c/a\u003e. Or you could skip straight to working on web-platform-tests, as discussed above.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAttempt to make your test cases produce clearly-differentiable results regarding the different outcomes you're investigating. You can then report the results back to the issue thread using the following Markdown syntax as a starting point:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-md notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"| Test case | Blink | Gecko | WebKit |\n|-----------------------------------------|-------|-------|--------|\n| Test case description 1 | | | |\n| Test case description 2 | | | |\n| Test case description 3 | | | |\"\u003e\u003cpre\u003e\u003cspan class=\"pl-ml\"\u003e|\u003c/span\u003e Test case \u003cspan class=\"pl-ml\"\u003e|\u003c/span\u003e Blink \u003cspan class=\"pl-ml\"\u003e|\u003c/span\u003e Gecko \u003cspan class=\"pl-ml\"\u003e|\u003c/span\u003e WebKit \u003cspan class=\"pl-ml\"\u003e|\u003c/span\u003e\n\u003cspan class=\"pl-ml\"\u003e|\u003c/span\u003e-----------------------------------------\u003cspan class=\"pl-ml\"\u003e|\u003c/span\u003e-------\u003cspan class=\"pl-ml\"\u003e|\u003c/span\u003e-------\u003cspan class=\"pl-ml\"\u003e|\u003c/span\u003e--------\u003cspan class=\"pl-ml\"\u003e|\u003c/span\u003e\n\u003cspan class=\"pl-ml\"\u003e|\u003c/span\u003e Test case description 1 \u003cspan class=\"pl-ml\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-ml\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-ml\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-ml\"\u003e|\u003c/span\u003e\n\u003cspan class=\"pl-ml\"\u003e|\u003c/span\u003e Test case description 2 \u003cspan class=\"pl-ml\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-ml\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-ml\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-ml\"\u003e|\u003c/span\u003e\n\u003cspan class=\"pl-ml\"\u003e|\u003c/span\u003e Test case description 3 \u003cspan class=\"pl-ml\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-ml\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-ml\"\u003e|\u003c/span\u003e \u003cspan class=\"pl-ml\"\u003e|\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIf there are additional interesting engine variations you are testing, for example older versions or engines not in the list, feel free to add more columns. If you can't test certain engines, leave a question mark in that cell, and others on the thread can help fill them in.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFor examples of this kind of investigation in action, see \u003ca href=\"https://github.com/whatwg/html/issues/775#issuecomment-190796607\" data-hovercard-type=\"issue\" data-hovercard-url=\"/whatwg/html/issues/775/hovercard\"\u003ewhatwg/html issue #775\u003c/a\u003e or \u003ca href=\"https://github.com/whatwg/html/issues/1087#issue-150128324\" data-hovercard-type=\"issue\" data-hovercard-url=\"/whatwg/html/issues/1087/hovercard\"\u003ewhatwg/html issue #1087\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eFurther principles and guidelines\u003c/h2\u003e\u003ca id=\"user-content-further-principles-and-guidelines\" class=\"anchor\" aria-label=\"Permalink: Further principles and guidelines\" href=\"#further-principles-and-guidelines\"\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\"\u003eFor any changes please take into account the following principles and guidelines:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"https://www.w3.org/TR/html-design-principles/\" rel=\"nofollow\"\u003eHTML Design Principles\u003c/a\u003e (note that these are applicable outside of HTML too and you are expected to treat them as such)\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://w3ctag.github.io/design-principles/\" rel=\"nofollow\"\u003eClient-side API Design Principles\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://whatwg.org/working-mode\" rel=\"nofollow\"\u003eWHATWG Working Mode\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://whatwg.org/faq\" rel=\"nofollow\"\u003eWHATWG FAQ\u003c/a\u003e, in particular \u003ca href=\"https://whatwg.org/faq#removing-bad-ideas\" rel=\"nofollow\"\u003eIs there a process for removing bad ideas from a standard?\u003c/a\u003e and \u003ca href=\"https://whatwg.org/faq#adding-new-features\" rel=\"nofollow\"\u003eHow should I go about proposing new features to WHATWG standards?\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\"\u003eDownstream impact\u003c/h2\u003e\u003ca id=\"user-content-downstream-impact\" class=\"anchor\" aria-label=\"Permalink: Downstream impact\" href=\"#downstream-impact\"\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\"\u003eIf you change exported definitions or algorithms, \u003ca href=\"https://dontcallmedom.github.io/webdex/\" rel=\"nofollow\"\u003eWebdex\u003c/a\u003e allows you to evaluate the impact of your change on other specifications. If any are impacted please do notify them by filing issues or creating pull requests.\u003c/p\u003e\n\u003c/article\u003e","renderedFileInfo":null,"shortPath":null,"symbolsEnabled":true,"tabSize":8,"topBannersInfo":{"overridingGlobalFundingFile":false,"globalPreferredFundingPath":null,"showInvalidCitationWarning":false,"citationHelpUrl":"https://docs.github.com/github/creating-cloning-and-archiving-repositories/creating-a-repository-on-github/about-citation-files","actionsOnboardingTip":null},"truncated":false,"viewable":true,"workflowRedirectUrl":null,"symbols":{"timed_out":false,"not_analyzed":false,"symbols":[{"name":"Contributor Guidelines","kind":"section_1","ident_start":2,"ident_end":24,"extent_start":0,"extent_end":6720,"fully_qualified_name":"Contributor Guidelines","ident_utf16":{"start":{"line_number":0,"utf16_col":2},"end":{"line_number":0,"utf16_col":24}},"extent_utf16":{"start":{"line_number":0,"utf16_col":0},"end":{"line_number":79,"utf16_col":0}}},{"name":"New 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style="display:inline-block;user-select:none;vertical-align:text-bottom;overflow:visible"><path d="M8 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path></svg></button> </div></div></div></div></div></div></div></div><div class="Box-sc-g0xbh4-0 dJxjrT react-code-view-bottom-padding"> <div class="Box-sc-g0xbh4-0 eFxKDQ"></div> <!-- --> <!-- --> </div><div class="Box-sc-g0xbh4-0 dJxjrT"> <!-- --> <!-- --> <button hidden="" data-testid="" data-hotkey-scope="read-only-cursor-text-area"></button><button hidden=""></button><div class="d-flex flex-column border rounded-2 mb-3 pl-1"><div class="Box-sc-g0xbh4-0 dzCJzi"><h2 class="sr-only ScreenReaderHeading-module__userSelectNone--vW4Cq prc-Heading-Heading-6CmGO" data-testid="screen-reader-heading">Latest commit</h2><div style="width:120px" class="Skeleton Skeleton--text" data-testid="loading"> </div><div class="d-flex flex-shrink-0 gap-2"><div 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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" class="prc-Button-Label-pTQ3x"><span class="fgColor-default">History</span></span></span></a><div class="d-sm-none"></div><div class="d-flex d-lg-none"><span role="tooltip" aria-label="History" id="history-icon-button-tooltip" class="Tooltip__TooltipBase-sc-17tf59c-0 hWlpPn tooltipped-n"><a href="/whatwg/meta/commits/main/CONTRIBUTING.md" class="prc-Button-ButtonBase-c50BI LinkButton-module__code-view-link-button--xvCGA flex-items-center fgColor-default" data-loading="false" data-size="small" data-variant="invisible" aria-describedby=":Rpdlal9lab:-loading-announcement history-icon-button-tooltip"><span data-component="buttonContent" data-align="center" class="prc-Button-ButtonContent-HKbr-"><span data-component="leadingVisual" class="prc-Button-Visual-2epfX prc-Button-VisualWrap-Db-eB"><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></a></span></div></div></div></div></div><div class="Box-sc-g0xbh4-0 ldRxiI"><div class="Box-sc-g0xbh4-0 fVkfyA container"><div class="Box-sc-g0xbh4-0 gNAmSV react-code-size-details-banner"><div class="Box-sc-g0xbh4-0 jNEwzY react-code-size-details-banner"><div 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style="display:inline-block;user-select:none;vertical-align:text-bottom;overflow:visible"><path d="M3.47 7.78a.75.75 0 0 1 0-1.06l4.25-4.25a.75.75 0 0 1 1.06 0l4.25 4.25a.751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018L9 4.81v7.44a.75.75 0 0 1-1.5 0V4.81L4.53 7.78a.75.75 0 0 1-1.06 0Z"></path></svg></span><span data-component="text" class="prc-Button-Label-pTQ3x">Top</span></span></button></div></div></div><div class="Box-sc-g0xbh4-0 kTvpNk"><h2 class="sr-only ScreenReaderHeading-module__userSelectNone--vW4Cq prc-Heading-Heading-6CmGO" data-testid="screen-reader-heading">File metadata and controls</h2><div class="Box-sc-g0xbh4-0 iNMjfP"><ul aria-label="File view" class="SegmentedControl__SegmentedControlList-sc-1rzig82-0 lawgDG" data-size="small"><li class="Box-sc-g0xbh4-0 fefCSX" data-selected="true"><button aria-current="true" class="SegmentedControlButton__SegmentedControlButtonStyled-sc-8lkgxl-0 dwImxt" type="button"><span class="segmentedControl-content"><div 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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 class="react-blob-header-edit-and-raw-actions-combined"><button data-component="IconButton" type="button" aria-label="Edit and raw actions" title="More file actions" data-testid="more-file-actions-button" aria-haspopup="true" aria-expanded="false" tabindex="0" class="Box-sc-g0xbh4-0 ffkqe prc-Button-ButtonBase-c50BI js-blob-dropdown-click prc-Button-IconButton-szpyj" data-loading="false" data-no-visuals="true" data-size="small" data-variant="invisible" aria-describedby=":Rnsptal9lab:-loading-announcement" id=":Rnsptal9lab:"><svg aria-hidden="true" focusable="false" class="octicon octicon-kebab-horizontal" 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="M8 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path></svg></button></div></div></div></div><div></div></div><div class="Box-sc-g0xbh4-0 hGyMdv"><section aria-labelledby="file-name-id-wide file-name-id-mobile" class="Box-sc-g0xbh4-0 fGqKFv"><div class="Box-sc-g0xbh4-0 eoaCFS js-snippet-clipboard-copy-unpositioned undefined" 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">Contributor Guidelines</h1><a id="user-content-contributor-guidelines" class="anchor" aria-label="Permalink: Contributor Guidelines" href="#contributor-guidelines"><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">These are the general guidelines for contributing to WHATWG standards.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">New issues</h2><a id="user-content-new-issues" class="anchor" aria-label="Permalink: New issues" href="#new-issues"><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">Please do file these, they are appreciated! Consider reading the <a href="https://whatwg.org/faq" rel="nofollow">FAQ</a> and <a href="https://whatwg.org/working-mode" rel="nofollow">Working Mode</a> if you are new to standardization.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Participation agreement</h2><a id="user-content-participation-agreement" class="anchor" aria-label="Permalink: Participation agreement" href="#participation-agreement"><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">Please ensure you, or your employer if you work in the field of web technologies, can sign the <a href="https://participate.whatwg.org/agreement" rel="nofollow">Contributor and Workstream Participant Agreement</a>.</p> <p dir="auto">If this is your first time contributing to the WHATWG standards, check out the global list of <a href="https://github.com/search?q=is%3Aopen+label%3A%22good+first+issue%22+user%3Awhatwg&type=Issues">good first issues</a> and find one you want to work on. You should comment in the thread to let others know you will be working on the issue. This is a great time to ask any questions that you may have.</p> <p dir="auto">Contributions to older issues are always appreciated. If an issue hasn't been updated in a while, you should ask if the issue is still relevant before working on it. If someone else was previously working on an issue, and you want to work on it, it's polite to ask that person if you can work on the issue before taking it.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Committing</h2><a id="user-content-committing" class="anchor" aria-label="Permalink: Committing" href="#committing"><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">See <a href="/whatwg/meta/blob/main/COMMITTING.md">COMMITTING.md</a> for further details.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Pull requests</h2><a id="user-content-pull-requests" class="anchor" aria-label="Permalink: Pull requests" href="#pull-requests"><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">Leave the <strong>Allow edits from maintainers</strong> option enabled to allow reviewers to fix trivial issues directly on your branch rather than needing to write review comments asking you make the edits. For more details, see <a href="https://github.com/blog/2247-improving-collaboration-with-forks">Improving collaboration with forks</a> in the GitHub Blog.</p> <p dir="auto">After you have created a pull request, HTML and HTML diff output will be generated, and a bot will take care of linking those from your pull request comment (typically within several minutes). These are useful for review and implementing from the standard with the proposed change incorporated.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Building</h2><a id="user-content-building" class="anchor" aria-label="Permalink: Building" href="#building"><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 WHATWG standards, apart from HTML, have a <code>Makefile</code> in their repository to help with building them. You'll need <code>make</code> and <a href="https://curl.haxx.se/" rel="nofollow"><code>curl</code></a> installed at the minimum; ideally you'll also have a full Bash shell. These prerequisites should be present on most Linux and macOS systems already. For Windows, we recommend <a href="https://gitforwindows.org/" rel="nofollow">Git Bash</a> and <a href="http://gnuwin32.sourceforge.net/packages/make.htm" rel="nofollow">Make for Windows</a>.</p> <p dir="auto">Once you have the prerequisites, you can run <code>make</code> in the standard's directory to build the spec; it will appear as a <code>.html</code> file in the same directory. This will call out to a web service to build the standard, so be sure you're connected to the internet.</p> <p dir="auto">Other Make targets are also available:</p> <ul dir="auto"> <li><code>make deploy</code> will do a full "deploy" of the standard, including error checking, commit snapshot production, any extra build steps, into a local subdirectory.</li> <li><code>make local</code> will do a local build, without calling out to any web services. This requires having <a href="https://github.com/tabatkins/bikeshed">Bikeshed</a> installed locally.</li> </ul> <p dir="auto">Due to its large size, the HTML Standard has its own build process, which you can read about in the <a href="https://github.com/whatwg/html-build/blob/main/README.md">html-build repository</a>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Tests</h2><a id="user-content-tests" class="anchor" aria-label="Permalink: Tests" href="#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">For normative changes, a corresponding <a href="https://github.com/w3c/web-platform-tests">web-platform-tests</a> pull request (PR) is needed. The author and reviewer can be different from the PR for the standard. If current behavior is unclear, writing tests first can help inform the discussion. Typically, both PRs will be merged at the same time.</p> <p dir="auto">To be clear, a test PR with changes that conflict with the standard cannot land before the corresponding standard is changed.</p> <p dir="auto">If testing is not practical, please explain why and if appropriate <a href="https://github.com/w3c/web-platform-tests/issues/new">file an issue</a> to follow up later.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Investigation</h2><a id="user-content-investigation" class="anchor" aria-label="Permalink: Investigation" href="#investigation"><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">Often in the course of discussing a potential change, issue with a standard, or browser bug, it's useful to investigate the behavior in question in a variety of rendering engines and provide data back to the discussion. The best way to do this is to host a small test case and report the results in various engines.</p> <p dir="auto">For simple cases (not involving multiple files), sites like <a href="https://software.hixie.ch/utilities/js/live-dom-viewer/" rel="nofollow">Live DOM Viewer</a> or <a href="https://jsbin.com/" rel="nofollow">JSBin</a> are recommended. For cases involving multiple files, you'll likely need to use your own hosting, for example using <a href="https://pages.github.com/">GitHub Pages</a>. Or you could skip straight to working on web-platform-tests, as discussed above.</p> <p dir="auto">Attempt to make your test cases produce clearly-differentiable results regarding the different outcomes you're investigating. You can then report the results back to the issue thread using the following Markdown syntax as a starting point:</p> <div class="highlight highlight-text-md notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="| Test case | Blink | Gecko | WebKit | |-----------------------------------------|-------|-------|--------| | Test case description 1 | | | | | Test case description 2 | | | | | Test case description 3 | | | |"><pre><span class="pl-ml">|</span> Test case <span class="pl-ml">|</span> Blink <span class="pl-ml">|</span> Gecko <span class="pl-ml">|</span> WebKit <span class="pl-ml">|</span> <span class="pl-ml">|</span>-----------------------------------------<span class="pl-ml">|</span>-------<span class="pl-ml">|</span>-------<span class="pl-ml">|</span>--------<span class="pl-ml">|</span> <span class="pl-ml">|</span> Test case description 1 <span class="pl-ml">|</span> <span class="pl-ml">|</span> <span class="pl-ml">|</span> <span class="pl-ml">|</span> <span class="pl-ml">|</span> Test case description 2 <span class="pl-ml">|</span> <span class="pl-ml">|</span> <span class="pl-ml">|</span> <span class="pl-ml">|</span> <span class="pl-ml">|</span> Test case description 3 <span class="pl-ml">|</span> <span class="pl-ml">|</span> <span class="pl-ml">|</span> <span class="pl-ml">|</span></pre></div> <p dir="auto">If there are additional interesting engine variations you are testing, for example older versions or engines not in the list, feel free to add more columns. If you can't test certain engines, leave a question mark in that cell, and others on the thread can help fill them in.</p> <p dir="auto">For examples of this kind of investigation in action, see <a href="https://github.com/whatwg/html/issues/775#issuecomment-190796607" data-hovercard-type="issue" data-hovercard-url="/whatwg/html/issues/775/hovercard">whatwg/html issue #775</a> or <a href="https://github.com/whatwg/html/issues/1087#issue-150128324" data-hovercard-type="issue" data-hovercard-url="/whatwg/html/issues/1087/hovercard">whatwg/html issue #1087</a>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Further principles and guidelines</h2><a id="user-content-further-principles-and-guidelines" class="anchor" aria-label="Permalink: Further principles and guidelines" href="#further-principles-and-guidelines"><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">For any changes please take into account the following principles and guidelines:</p> <ul dir="auto"> <li><a href="https://www.w3.org/TR/html-design-principles/" rel="nofollow">HTML Design Principles</a> (note that these are applicable outside of HTML too and you are expected to treat them as such)</li> <li><a href="https://w3ctag.github.io/design-principles/" rel="nofollow">Client-side API Design Principles</a></li> <li><a href="https://whatwg.org/working-mode" rel="nofollow">WHATWG Working Mode</a></li> <li><a href="https://whatwg.org/faq" rel="nofollow">WHATWG FAQ</a>, in particular <a href="https://whatwg.org/faq#removing-bad-ideas" rel="nofollow">Is there a process for removing bad ideas from a standard?</a> and <a href="https://whatwg.org/faq#adding-new-features" rel="nofollow">How should I go about proposing new features to WHATWG standards?</a></li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Downstream impact</h2><a id="user-content-downstream-impact" class="anchor" aria-label="Permalink: Downstream impact" href="#downstream-impact"><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">If you change exported definitions or algorithms, <a href="https://dontcallmedom.github.io/webdex/" rel="nofollow">Webdex</a> allows you to evaluate the impact of your change on other specifications. 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