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Test for breakage | Privacy Sandbox | Google for Developers
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role="banner"> <div class="devsite-header--inner nocontent"> <div class="devsite-top-logo-row-wrapper-wrapper"> <div class="devsite-top-logo-row-wrapper"> <div class="devsite-top-logo-row"> <button type="button" id="devsite-hamburger-menu" class="devsite-header-icon-button button-flat material-icons gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Navigation menu button" visually-hidden aria-label="Open menu"> </button> <div class="devsite-product-name-wrapper"> <a href="https://developers.google.com/privacy-sandbox"> <div class="devsite-product-logo-container" size="medium" > <picture> <img class="devsite-product-logo" alt="Privacy Sandbox" src="https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo.png" srcset="https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_36.png 36w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_48.png 48w, 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class="devsite-product-name"> <ul class="devsite-breadcrumb-list" > <li class="devsite-breadcrumb-item "> <a href="https://developers.google.com/privacy-sandbox" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Upper Header" data-value="1" track-type="globalNav" track-name="breadcrumb" track-metadata-position="1" track-metadata-eventdetail="Privacy Sandbox" > Privacy Sandbox </a> </li> </ul> </span> </div> <div class="devsite-top-logo-row-middle"> <div class="devsite-header-upper-tabs"> <devsite-tabs class="upper-tabs"> <nav class="devsite-tabs-wrapper" aria-label="Upper tabs"> <tab > <a href="https://developers.google.com/privacy-sandbox" track-metadata-eventdetail="https://developers.google.com/privacy-sandbox" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - overview" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Overview" track-name="overview" > Overview </a> </tab> <tab class="devsite-active"> <a href="https://developers.google.com/privacy-sandbox/cookies" track-metadata-eventdetail="https://developers.google.com/privacy-sandbox/cookies" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - cookies" track-metadata-module="primary nav" aria-label="Cookies, selected" data-category="Site-Wide Custom Events" data-label="Tab: Cookies" track-name="cookies" > Cookies </a> </tab> <tab > <a href="https://developers.google.com/privacy-sandbox/private-advertising" track-metadata-eventdetail="https://developers.google.com/privacy-sandbox/private-advertising" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - private advertising" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Private advertising" track-name="private advertising" > Private advertising </a> </tab> <tab > <a href="https://developers.google.com/privacy-sandbox/protections" track-metadata-eventdetail="https://developers.google.com/privacy-sandbox/protections" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - privacy protections" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Privacy protections" track-name="privacy protections" > Privacy protections </a> </tab> <tab > <a href="https://developers.google.com/privacy-sandbox/learn" track-metadata-eventdetail="https://developers.google.com/privacy-sandbox/learn" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - learn" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Learn" track-name="learn" > Learn </a> </tab> <tab > <a href="https://developers.google.com/privacy-sandbox/blog" track-metadata-eventdetail="https://developers.google.com/privacy-sandbox/blog" class="devsite-tabs-content gc-analytics-event " track-type="nav" track-metadata-position="nav - blog" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Blog" track-name="blog" > Blog </a> </tab> </nav> </devsite-tabs> </div> <devsite-search enable-signin enable-search enable-suggestions enable-query-completion project-name="Privacy Sandbox" tenant-name="Google for Developers" project-scope="/privacy-sandbox" url-scoped="https://developers.google.com/s/results/privacy-sandbox" > <form class="devsite-search-form" action="https://developers.google.com/s/results" method="GET"> <div class="devsite-search-container"> <button type="button" search-open class="devsite-search-button devsite-header-icon-button button-flat material-icons" aria-label="Open search"></button> <div class="devsite-searchbox"> <input aria-activedescendant="" aria-autocomplete="list" aria-label="Search" aria-expanded="false" aria-haspopup="listbox" autocomplete="off" class="devsite-search-field devsite-search-query" name="q" placeholder="Search" role="combobox" type="text" value="" > <div class="devsite-search-image material-icons" aria-hidden="true"> </div> <div class="devsite-search-shortcut-icon-container" aria-hidden="true"> <kbd class="devsite-search-shortcut-icon">/</kbd> </div> </div> </div> </form> <button type="button" search-close class="devsite-search-button devsite-header-icon-button button-flat material-icons" aria-label="Close search"></button> </devsite-search> </div> <devsite-language-selector> <ul role="presentation"> <li role="presentation"> <a role="menuitem" lang="en" >English</a> </li> <li role="presentation"> <a role="menuitem" lang="de" >Deutsch</a> </li> <li role="presentation"> <a role="menuitem" lang="es" >Español</a> </li> <li role="presentation"> <a role="menuitem" lang="es_419" >Español – América Latina</a> </li> <li role="presentation"> <a role="menuitem" lang="fr" >Français</a> </li> <li role="presentation"> <a role="menuitem" lang="id" >Indonesia</a> </li> <li role="presentation"> <a role="menuitem" lang="it" >Italiano</a> </li> <li role="presentation"> <a role="menuitem" lang="pl" >Polski</a> </li> <li role="presentation"> <a role="menuitem" lang="pt_br" >Português – Brasil</a> </li> <li role="presentation"> <a role="menuitem" lang="vi" >Tiếng Việt</a> </li> <li role="presentation"> <a role="menuitem" lang="tr" >Türkçe</a> </li> <li role="presentation"> <a role="menuitem" lang="ru" >Русский</a> </li> <li role="presentation"> <a role="menuitem" lang="he" >עברית</a> </li> <li role="presentation"> <a role="menuitem" lang="ar" >العربيّة</a> </li> <li role="presentation"> <a role="menuitem" lang="fa" >فارسی</a> </li> <li role="presentation"> <a role="menuitem" lang="hi" >हिंदी</a> </li> <li role="presentation"> <a role="menuitem" lang="bn" >বাংলা</a> </li> <li role="presentation"> <a role="menuitem" lang="th" >ภาษาไทย</a> </li> <li role="presentation"> <a role="menuitem" lang="zh_cn" >中文 – 简体</a> </li> <li role="presentation"> <a role="menuitem" lang="zh_tw" >中文 – 繁體</a> </li> <li role="presentation"> <a role="menuitem" lang="ja" >日本語</a> </li> <li role="presentation"> <a role="menuitem" lang="ko" >한국어</a> </li> </ul> </devsite-language-selector> <a class="devsite-header-link devsite-top-button button gc-analytics-event" href="//privacysandbox.com/" data-category="Site-Wide Custom Events" data-label="Site header link" > Home </a> <devsite-user enable-profiles fp-auth id="devsite-user"> <span class="button devsite-top-button" aria-hidden="true" visually-hidden>Sign in</span> </devsite-user> </div> </div> </div> <div class="devsite-collapsible-section devsite-header-no-lower-tabs "> <div class="devsite-header-background"> <div class="devsite-product-id-row" > <div class="devsite-product-description-row"> <ul class="devsite-breadcrumb-list" > <li class="devsite-breadcrumb-item "> <a href="https://developers.google.com/privacy-sandbox/cookies" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Lower Header" data-value="1" track-type="globalNav" track-name="breadcrumb" track-metadata-position="1" track-metadata-eventdetail="" > Cookies </a> </li> </ul> </div> </div> </div> </div> </div> </devsite-header> <devsite-book-nav scrollbars > <div class="devsite-book-nav-filter" > <span class="filter-list-icon material-icons" aria-hidden="true"></span> <input type="text" placeholder="Filter" aria-label="Type to filter" role="searchbox"> <span class="filter-clear-button hidden" data-title="Clear filter" aria-label="Clear filter" role="button" tabindex="0"></span> </div> <nav class="devsite-book-nav devsite-nav nocontent" aria-label="Side menu"> <div class="devsite-mobile-header"> <button type="button" id="devsite-close-nav" class="devsite-header-icon-button button-flat material-icons gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Close navigation" aria-label="Close navigation"> </button> <div class="devsite-product-name-wrapper"> <a href="https://developers.google.com/privacy-sandbox"> <div class="devsite-product-logo-container" size="medium" > <picture> <img class="devsite-product-logo" alt="Privacy Sandbox" src="https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo.png" srcset="https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_36.png 36w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_48.png 48w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_72.png 72w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_96.png 96w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_480.png 480w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_720.png 720w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_856.png 856w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_960.png 960w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_1440.png 1440w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_1920.png 1920w, https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo_2880.png 2880w" sizes="64px" loading="lazy" > </picture> </div> </a> <span class="devsite-product-name"> <ul class="devsite-breadcrumb-list" > <li class="devsite-breadcrumb-item "> <a href="https://developers.google.com/privacy-sandbox" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Upper Header" data-value="1" track-type="globalNav" track-name="breadcrumb" track-metadata-position="1" track-metadata-eventdetail="Privacy Sandbox" > Privacy Sandbox </a> </li> </ul> </span> </div> </div> <div class="devsite-book-nav-wrapper"> <div class="devsite-mobile-nav-top"> <ul class="devsite-nav-list"> <li class="devsite-nav-item"> <a href="/privacy-sandbox" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Overview" track-name="overview" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Overview" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Overview </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/privacy-sandbox/cookies" class="devsite-nav-title gc-analytics-event devsite-nav-has-children devsite-nav-active" data-category="Site-Wide Custom Events" data-label="Tab: Cookies" track-name="cookies" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Cookies" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Cookies </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/privacy-sandbox/private-advertising" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Private advertising" track-name="private advertising" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Private advertising" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Private advertising </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/privacy-sandbox/protections" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Privacy protections" track-name="privacy protections" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Privacy protections" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Privacy protections </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/privacy-sandbox/learn" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: Learn" track-name="learn" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Learn" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Learn </span> </a> </li> <li class="devsite-nav-item"> <a href="/privacy-sandbox/blog" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: Blog" track-name="blog" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Blog" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Blog </span> </a> </li> <li class="devsite-nav-item"> <a href="//privacysandbox.com/" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Home" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Home </span> </a> </li> </ul> </div> <div class="devsite-mobile-nav-bottom"> <ul class="devsite-nav-list" menu="_book"> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies" ><span class="devsite-nav-text" tooltip>About third-party cookies</span></a></li> <li class="devsite-nav-item devsite-nav-heading"><div class="devsite-nav-title devsite-nav-title-no-path"> <span class="devsite-nav-text" tooltip>Prepare for changes</span> </div></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/prepare/overview" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/prepare/overview" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/prepare/overview" ><span class="devsite-nav-text" tooltip>Overview</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/prepare/audit-cookies" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/prepare/audit-cookies" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/prepare/audit-cookies" ><span class="devsite-nav-text" tooltip>Audit cookies</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/prepare/test-for-breakage" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/prepare/test-for-breakage" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/prepare/test-for-breakage" ><span class="devsite-nav-text" tooltip>Test for breakage</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/prepare/debug" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/prepare/debug" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/prepare/debug" ><span class="devsite-nav-text" tooltip>Debug third-party cookie blocking</span></a></li> <li class="devsite-nav-item devsite-nav-heading"><div class="devsite-nav-title devsite-nav-title-no-path"> <span class="devsite-nav-text" tooltip>Solutions</span> </div></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/chips" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/chips" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/chips" ><span class="devsite-nav-text" tooltip>CHIPS</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/chips-transition" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/chips-transition" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/chips-transition" ><span class="devsite-nav-text" tooltip>Transition to partitioned cookies</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/storage-access-api" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/storage-access-api" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/storage-access-api" ><span class="devsite-nav-text" tooltip>Storage Access API</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/related-website-sets" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/related-website-sets" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/related-website-sets" ><span class="devsite-nav-text" tooltip>Related Website Sets</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/related-website-sets-integration" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/related-website-sets-integration" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/related-website-sets-integration" ><span class="devsite-nav-text" tooltip>Related Website Sets Developer guide</span></a></li> <li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Federated Credential Management API</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/fedcm" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/fedcm" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/fedcm" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/fedcm-developer-guide" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/fedcm-developer-guide" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/fedcm-developer-guide" ><span class="devsite-nav-text" tooltip>Developer guide</span></a></li><li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/fedcm-updates" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/fedcm-updates" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/fedcm-updates" ><span class="devsite-nav-text" tooltip>Updates</span></a></li><li class="devsite-nav-item"><a href="/privacy-sandbox/learn?api=federatedcredentialmanagement" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/learn?api=federatedcredentialmanagement" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/learn?api=federatedcredentialmanagement" ><span class="devsite-nav-text" tooltip>Tagged docs and blog posts</span></a></li></ul></div></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/storage-partitioning" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/storage-partitioning" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/storage-partitioning" ><span class="devsite-nav-text" tooltip>Storage partitioning</span></a></li> <li class="devsite-nav-item devsite-nav-heading"><div class="devsite-nav-title devsite-nav-title-no-path"> <span class="devsite-nav-text" tooltip>Guides</span> </div></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/guides" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/guides" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/guides" ><span class="devsite-nav-text" tooltip>Overview</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/guides/identity" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/guides/identity" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/guides/identity" ><span class="devsite-nav-text" tooltip>Identity</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/guides/embeds" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/guides/embeds" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/guides/embeds" ><span class="devsite-nav-text" tooltip>Embeds</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/resources/case-studies/times-internet" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/resources/case-studies/times-internet" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/resources/case-studies/times-internet" ><span class="devsite-nav-text" tooltip>Case study: Times Internet</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/resources/case-studies/mercado-libre" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/resources/case-studies/mercado-libre" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/resources/case-studies/mercado-libre" ><span class="devsite-nav-text" tooltip>Case study: Mercado Libre</span></a></li> <li class="devsite-nav-item devsite-nav-heading"><div class="devsite-nav-title devsite-nav-title-no-path"> <span class="devsite-nav-text" tooltip>Temporary exceptions</span> </div></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/temporary-exceptions/preserving-critical-user-experiences" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/temporary-exceptions/preserving-critical-user-experiences" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/temporary-exceptions/preserving-critical-user-experiences" ><span class="devsite-nav-text" tooltip>Overview</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/temporary-exceptions/grace-period" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/temporary-exceptions/grace-period" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/temporary-exceptions/grace-period" ><span class="devsite-nav-text" tooltip>Grace period</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/temporary-exceptions/grace-period-opt-out" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/temporary-exceptions/grace-period-opt-out" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/temporary-exceptions/grace-period-opt-out" ><span class="devsite-nav-text" tooltip>Grace period opt out</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/dashboard" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/dashboard" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/dashboard" ><span class="devsite-nav-text" tooltip>Compatibility lookup tool</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/temporary-exceptions/storage-partitioning-deprecation-trial" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/temporary-exceptions/storage-partitioning-deprecation-trial" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/temporary-exceptions/storage-partitioning-deprecation-trial" ><span class="devsite-nav-text" tooltip>Storage Partitioning deprecation trial</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/temporary-exceptions/heuristics-based-exceptions" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/temporary-exceptions/heuristics-based-exceptions" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/temporary-exceptions/heuristics-based-exceptions" ><span class="devsite-nav-text" tooltip>Heuristics based exceptions</span></a></li> <li class="devsite-nav-item"><a href="/privacy-sandbox/cookies/temporary-exceptions/chrome-enterprise" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /privacy-sandbox/cookies/temporary-exceptions/chrome-enterprise" track-type="bookNav" track-name="click" track-metadata-eventdetail="/privacy-sandbox/cookies/temporary-exceptions/chrome-enterprise" ><span class="devsite-nav-text" tooltip>Chrome Enterprise policies</span></a></li> </ul> </div> </div> </nav> </devsite-book-nav> <section id="gc-wrapper"> <main role="main" class="devsite-main-content" has-book-nav > <devsite-content> <article class="devsite-article"> <div class="devsite-banner devsite-banner-announcement nocontent" > <div class="devsite-banner-message"> <div class="devsite-banner-message-text"> Chrome is proposing a new experience for user choice with third-party cookies. Content on this page will be updated to reflect the changes. Find out more from privacysandbox.com. </div> </div> </div> <div class="devsite-article-meta nocontent" role="navigation"> <ul class="devsite-breadcrumb-list" aria-label="Breadcrumb"> <li class="devsite-breadcrumb-item "> <a href="https://developers.google.com/" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Breadcrumbs" data-value="1" track-type="globalNav" track-name="breadcrumb" track-metadata-position="1" track-metadata-eventdetail="" > Home </a> </li> <li class="devsite-breadcrumb-item "> <div class="devsite-breadcrumb-guillemet material-icons" aria-hidden="true"></div> <a href="https://developers.google.com/privacy-sandbox" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Breadcrumbs" data-value="2" track-type="globalNav" track-name="breadcrumb" track-metadata-position="2" track-metadata-eventdetail="Privacy Sandbox" > Privacy Sandbox </a> </li> <li class="devsite-breadcrumb-item "> <div class="devsite-breadcrumb-guillemet material-icons" aria-hidden="true"></div> <a href="https://developers.google.com/privacy-sandbox/cookies" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Breadcrumbs" data-value="3" track-type="globalNav" track-name="breadcrumb" track-metadata-position="3" track-metadata-eventdetail="" > Cookies </a> </li> </ul> <devsite-thumb-rating position="header"> </devsite-thumb-rating> </div> <devsite-feedback position="header" project-name="Privacy Sandbox" product-id="5335444" bucket="" context="" version="t-devsite-webserver-20241114-r00-rc02.464922260396498922" data-label="Send Feedback Button" track-type="feedback" track-name="sendFeedbackLink" track-metadata-position="header" class="nocontent" disable-product-feedback project-icon="https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo.png" > <button> Send feedback </button> </devsite-feedback> <h1 class="devsite-page-title" tabindex="-1"> Test for breakage </h1> <devsite-feature-tooltip ack-key="AckCollectionsBookmarkTooltipDismiss" analytics-category="Site-Wide Custom Events" analytics-action-show="Callout Profile displayed" analytics-action-close="Callout Profile dismissed" analytics-label="Create Collection Callout" class="devsite-page-bookmark-tooltip nocontent" dismiss-button="true" id="devsite-collections-dropdown" dismiss-button-text="Dismiss" close-button-text="Got it"> <devsite-bookmark></devsite-bookmark> <span slot="popout-heading"> Stay organized with collections </span> <span slot="popout-contents"> Save and categorize content based on your preferences. </span> </devsite-feature-tooltip> <div class="devsite-page-title-meta"><devsite-view-release-notes></devsite-view-release-notes></div> <devsite-toc class="devsite-nav" depth="2" devsite-toc-embedded > </devsite-toc> <div class="devsite-article-body clearfix "> <p><devsite-video video-id="3wtz3-O8z7Y"></devsite-video></p> <p><br><br></p> <p>Test your site to see how it performs without third-party cookies. That will help you begin the process of transitioning to <a href="/privacy-sandbox/cookies/chips">alternative solutions</a>.</p> <aside> Not sure if your site relies on third-party cookies? Try out the <a href="https://goo.gle/psat">Privacy Sandbox Analysis Tool</a>: a Chrome extension that augments Chrome DevTools to help you understand cookie usage and migrate to alternatives. </aside> <h2 id="chrome_flags_for_testing" data-text="Chrome flags for testing" tabindex="-1">Chrome flags for testing</h2> <p>The best way to test your site for breakage without third-party cookies in Chrome is to use the <code translate="no" dir="ltr">test-third-party-cookie-phaseout</code> flag. This flag makes Chrome behave as it does when third-party cookies are restricted, so it's ideal for testing the user experience without cross-site cookies. There are two ways to set the flag:</p> <ul> <li>Enable <code translate="no" dir="ltr">chrome://flags/#test-third-party-cookie-phaseout</code></li> <li>Run Chrome from the command line with the flag <code translate="no" dir="ltr">--test-third-party-cookie-phaseout</code></li> </ul> <p>This flag sets Chrome to block third-party cookies, and ensures that <a href="https://blog.google/products/chrome/privacy-sandbox-tracking-protection/">new features</a> and <a href="/privacy-sandbox/cookies/temporary-exceptions/preserving-critical-user-experiences">temporary mitigations</a> are active.</p> <aside> <a href="https://developer.chrome.com/docs/web-platform/chrome-flags">What are Chrome flags?</a> explains how to use command-line flags. </aside> <p>You can test your site by browsing with third-party cookies blocked using <code translate="no" dir="ltr">chrome://settings/cookies</code>, but the phaseout flag ensures that the new and updated features are also enabled. Blocking third-party cookies is a good approach to detecting issues, but doesn't necessarily help you validate you have fixed them.</p> <aside class="caution"> A quick way to check how a site works without third-party cookies is to open it in Incognito mode. However, Incognito mode also blocks first-party cookies and other data saved for a site, including form data and permissions settings. Extensions and browsing history are also not available. Incognito mode can be useful, but it doesn't provide a realistic site experience. </aside> <p>If you maintain an active test suite for your sites, then you should do two side-by-side runs: one with Chrome on the usual settings, and one with the same version of Chrome launched with the <code translate="no" dir="ltr">--test-third-party-cookie-phaseout</code> flag. Any test failures in the second run and not in the first are good candidates to investigate for third-party cookie dependencies.</p> <h2 id="test_specific_third-party_cookie_scenarios" data-text="Test specific third-party cookie scenarios" tabindex="-1">Test specific third-party cookie scenarios</h2> <p>In addition to <code translate="no" dir="ltr">--test-third-party-cookie-phaseout</code>, there are flags available for specific testing scenarios:</p> <ul> <li>All the following flags are supported on Windows, Mac, Linux, ChromeOS, and Android.</li> <li>These flags can be set from the <a href="https://developer.chrome.com/docs/web-platform/chrome-flags#chromeflags">chrome://flags page</a> or from the <a href="https://developer.chrome.com/docs/web-platform/chrome-flags#command-line_flags">command line</a>.</li> <li>To set flags for multiple features from the command line with <code translate="no" dir="ltr">--enable-features</code> or <code translate="no" dir="ltr">--disable-features</code>, add a comma between each feature name.</li> <li>You can work out the value to use for a command-line flag by setting the flag from <code translate="no" dir="ltr">chrome://flags</code>, and then viewing <strong>Command Line</strong> values on the <code translate="no" dir="ltr">chrome://version</code> page.</li> </ul> <figure> <img src="/static/privacy-sandbox/assets/images/chrome-version-command-line-flag.png" alt="chrome://version page with a flag in the Command Line section highlighted" width="800" height="444"> <figcaption>chrome://version page Command Line section, showing custom flag settings</figcaption> </figure> <h3 id="test_with_temporary_mitigations_blocked" data-text="Test with temporary mitigations blocked" tabindex="-1">Test with temporary mitigations blocked</h3> <p>When testing your site with the phaseout flag, <a href="/privacy-sandbox/cookies/temporary-exceptions/preserving-critical-user-experiences">temporary mitigations</a> and Chrome's third-party cookie <a href="/privacy-sandbox/cookies/temporary-exceptions/grace-period">grace period</a> may mean that third-party cookies are not restricted by your site or the third-party services it accesses.</p> <p>The following table shows how to use Chrome flags for testing, and explains their effect when disabled or enabled.</p> <p><br></p> <table> <thead> <tr> <th><strong>Name</strong></th> <th><strong>Purpose</strong></th> <th><strong>Min version</strong></th> <th><strong>chrome://flags</strong></th> <th><strong>Command-line flag</strong></th> </tr> </thead> <tbody> <tr> <td>Tracking Protection for 3PCD</td> <td><b>Enabled</b>: turn on <a href="https://blog.google/products/chrome/privacy-sandbox-tracking-protection/">Tracking Protection</a>: <br> • Show the eye icon UI in the address bar (Omnibox) to allow the user to temporarily enable third-party cookies for a site.<br> • Provide <code translate="no" dir="ltr">chrome://settings/trackingProtection</code> instead of <code translate="no" dir="ltr">chrome://settings/cookies</code></td> <td>121</td> <td><code translate="no" dir="ltr">#tracking-protection-3pcd</code></td> <td><code translate="no" dir="ltr">--enable-features=TrackingProtection3pcd</code> <br><br> <code translate="no" dir="ltr">--disable-features=TrackingProtection3pcd</code></td> </tr> <tr> <td>Test Third Party Cookie Restrictions</td> <td><b>Disabled</b>: this is the default. (No effect.) <br> <br> <b>Enabled</b>: Restrict third-party cookies and enable the <a href="https://blog.google/products/chrome/privacy-sandbox-tracking-protection/">Tracking Protection</a> UI. <br> <br> This setting overrides the <a href="https://chromeenterprise.google/policies/#BlockThirdPartyCookies"><code translate="no" dir="ltr">BlockThirdPartyCookies=false</code></a> Chrome Enterprise policy, but is overridden by content settings, such as those granted by the <a href="https://goo.gle/saa">Storage Access API</a> or the <a href="https://chromeenterprise.google/policies/#CookiesAllowedForUrls">CookiesAllowedForUrls</a> policy. <br> <br> <a href="#chrome_flags_and_chrome_settings">Flags and settings</a> describes how user settings interact with this flag.</td> <td>121</td> <td><code translate="no" dir="ltr">#test-third-party-cookie-phaseout</code></td> <td><code translate="no" dir="ltr">--test-third-party-cookie-phaseout</code></td> </tr> <tr> <td>Third-party Cookie Facilitated Testing</td> <td><b>Enabled</b>: this is the default. Allow a <a href="https://developer.chrome.com/en/docs/privacy-sandbox/chrome-testing/">Chrome-facilitated testing group</a> experiment arm to be set for this Chrome client.<br> <br> <b>Disabled</b>: don't allow an experiment arm to be set by Chrome.<br> <br> <b>Other values</b>: manually set a specific experiment arm.<br> <br> Most developers will need to use one of the <code translate="no" dir="ltr">Enabled Force</code> settings. These bypass eligibility checks and predictably place the Chrome client into the selected group arm. The <code translate="no" dir="ltr">Enabled</code> settings allow the client to be included in an experiment arm, but don't force inclusion.</td> <td>121</td> <td><code translate="no" dir="ltr">#tpc-phase-out-facilitated-testing</code></td> <td><code translate="no" dir="ltr">--enable-features=CookieDeprecationFacilitatedTesting</code> <br><br> <code translate="no" dir="ltr">--disable-features=CookieDeprecationFacilitatedTesting</code> <br> <br> For other values, command-line values depend on the setting. For example, to set <code translate="no" dir="ltr">Enabled Force Control 1</code>: <br> <br> <code translate="no" dir="ltr">--enable-features=CookieDeprecationFacilitatedTesting:force_eligible/true/disable_3p_cookies/false/disable_ads_apis/false/label/fake_control_1%2E1/version/9994</code><br> <br> If you need to set these values from the command line, it's probably easiest to set the value from <code translate="no" dir="ltr">chrome://flags</code>, restart the browser, then copy the flag value from the <strong>Command Line</strong> section of the <code translate="no" dir="ltr">chrome://version</code> page. </td> </tr> <tr> <td>Third-Party Cookie Deprecation Metadata Grants for Testing</td> <td><b>Enabled</b>: this is the default. Allow the third-party cookie <a href="/privacy-sandbox/cookies/temporary-exceptions/grace-period">grace period</a> to take effect.<br> <br> <b>Disabled</b>: Make Chrome behave as if the grace period is not in effect.</td> <td>121</td> <td><code translate="no" dir="ltr">#tpcd-metadata-grants</code></td> <td><code translate="no" dir="ltr">--enable-features=TpcdMetadataGrants</code> <br><br> <code translate="no" dir="ltr">--disable-features=TpcdMetadataGrants</code></td> </tr> <tr> <td>Third-party Cookie Grants Heuristics Testing</td> <td><b>Default</b>: allow <a href="/privacy-sandbox/cookies/temporary-exceptions/heuristics-based-exceptions">heuristics-based mitigations</a>.<br> <br> <b>Enabled</b>: no effect. (Same as <b>Default</b>.)<br> <br> <b>Disabled</b>: don't allow heuristics-based mitigations. This can be useful for testing that other longer-term fixes (without third-party cookies) are working as expected without heuristics mitigations.<br> <br> Other flag values are as follows.<br> <br> <code translate="no" dir="ltr">CurrentInteraction</code>: require a user interaction on the third-party site <em>during</em> the dialog or redirect flow.<br> <br> <code translate="no" dir="ltr">ShortRedirect</code> redirect heuristic grants cookie access for 15 minutes: third-party cookies are allowed for redirect scenarios as described in <a href="/privacy-sandbox/cookies/temporary-exceptions/heuristics-based-exceptions">heuristics-based mitigations</a>.<br> <br> <code translate="no" dir="ltr">LongRedirect</code>: redirect heuristic grants cookie access for 30 days.<br> <br> <code translate="no" dir="ltr">MainFrame:</code>only popups initiated by the main frame can enable the redirect heuristic. <br> <code translate="no" dir="ltr"><br> AllFrameInitiator</code>: popups initiated by any frame can enable the redirect heuristic.</td> <td>120</td> <td><code translate="no" dir="ltr">#tpcd-heuristics-grants</code></td> <td><code translate="no" dir="ltr">--enable-features=TpcdHeuristicsGrants</code> <br><br> <code translate="no" dir="ltr">--disable-features=TpcdHeuristicsGrants</code> <br><br> For other values, set the value from <code translate="no" dir="ltr">chrome://flags</code>, restart the browser, then copy the flag value from the <strong>Command Line</strong> section of the <code translate="no" dir="ltr">chrome://version</code> page.</td> </tr> </tbody> </table> <p><br></p> <aside> <code translate="no" dir="ltr">#tracking-protection-3pcd</code> must be enabled for the following to work: <br><br> <code translate="no" dir="ltr">#tpcd-metadata-grants</code><br> <code translate="no" dir="ltr">#tpcd-heuristics-grants</code> <br><br> From Chrome 121 <code translate="no" dir="ltr">#test-third-party-cookie-phaseout</code> implies <code translate="no" dir="ltr">#tracking-protection-3pcd</code>, so you can enable either flag to allow the other flags to work. </aside> <h3 id="chrome_flags_and_chrome_settings" data-text="Chrome flags and Chrome settings" tabindex="-1">Chrome flags and Chrome settings</h3> <p>Blocking third-party cookies <a href="https://support.google.com/chrome/answer/95647">from Chrome user settings</a> has a different effect from the default behavior when using Chrome with the <code translate="no" dir="ltr">chrome://flags#test-third-party-cookie-phaseout</code> flag enabled.</p> <p>With only the flag enabled, third-party cookies are handled as they are for Chrome's Tracking Protection test group: third-party cookies are still allowed in short-term, <a href="/privacy-sandbox/cookies/temporary-exceptions/preserving-critical-user-experiences">limited cases</a> to allow critical services to function, and also through the longer-term solutions of <a href="/privacy-sandbox/cookies/chips">CHIPS</a> and the <a href="/privacy-sandbox/cookies/storage-access-api">Storage Access API</a>.</p> <p>If <strong>Block all third-party cookies</strong> is enabled from <code translate="no" dir="ltr">chrome://settings/trackingProtection</code> (or <strong>Block third-party cookies</strong> from <code translate="no" dir="ltr">chrome://settings/cookies</code>, for those not in the Tracking Protection group) Chrome does not allow <strong>any</strong> access to third-party cookies or other unpartitioned state, unless third-party cookies are allowed by a Chrome Enterprise <a href="https://chromeenterprise.google/policies/#CookiesAllowedForUrls">CookiesAllowedForUrls</a> policy, or the user explicitly grants permission:</p> <ul> <li>Using the eye icon in the address bar (Omnibox).</li> <li>Adding an entry under <strong>Sites allowed to use third-party cookies</strong> on the <code translate="no" dir="ltr">chrome://settings/trackingProtection</code> page.</li> <li>Adding an entry to <strong>Allowed to use third-party cookies</strong> on <code translate="no" dir="ltr">chrome://settings/cookies</code>.</li> </ul> <p>If the <a href="https://chromeenterprise.google/policies/#BlockThirdPartyCookies">BlockThirdPartyCookies</a> policy is set to <code translate="no" dir="ltr">false</code> for a Chrome Enterprise user, they won't be able to block third-party cookies from <code translate="no" dir="ltr">chrome://settings</code>.</p> <aside> If you regularly run Chrome channels with command flags, you might want to create a function to run Chrome with flags for each channel, and add these functions to your shell RC file. For example, on macOS: <br><br> <code translate="no" dir="ltr">alias cf(){ open -a 'Google Chrome Canary' --args $*; }</code> <br><br> Note that flags set from the command line are not reflected by the settings displayed on the <code translate="no" dir="ltr">chrome://flags</code> page. </aside> <h3 id="use_flag_combinations_to_simulate_usage_scenarios" data-text="Use flag combinations to simulate usage scenarios" tabindex="-1">Use flag combinations to simulate usage scenarios</h3> <table> <thead> <tr> <th><strong>Scenario</strong></th> <th><code translate="no" dir="ltr">#tracking-protection-3pcd</code></th> <th><code translate="no" dir="ltr">#tpcd-metadata-grants</code></th> </tr> </thead> <tbody> <tr> <td>1% testing</td> <td>Enabled</td> <td>Disabled</td> </tr> <tr> <td><a href="/privacy-sandbox/cookies/temporary-exceptions/grace-period">Grace period</a> registration approved for domain, but no token yet supplied</td> <td>Enabled</td> <td>Enabled</td> </tr> <tr> <td>Grace period active, token supplied</td> <td>Enabled</td> <td>Disabled</td> </tr> <tr> <td>Grace period <a href="/privacy-sandbox/blog/grace-period-update">no longer active</a>, token supplied</td> <td>Enabled</td> <td>[No effect]</td> </tr> </tbody> </table> <h2 id="support" data-text="Support" tabindex="-1">Support</h2> <ul> <li>Report third-party cookie breakage: <a href="https://goo.gle/report-3pc-broken">goo.gle/report-3pc-broken</a></li> <li>Raise an issue in the Privacy Sandbox Developer Support repository: <a href="https://goo.gle/cookies-support">goo.gle/cookies-support</a></li> </ul> <h2 id="find_out_more" data-text="Find out more" tabindex="-1">Find out more</h2> <ul> <li><a href="/privacy-sandbox/blog/cookie-countdown-2024jan">Third-party cookies restricted by default for 1% of Chrome users</a></li> <li><a href="https://developer.chrome.com/docs/web-platform/chrome-flags">What are Chrome flags?</a></li> <li><a href="https://developer.chrome.com/docs/web-platform/chrome-variations">What are Chrome Variations?</a></li> </ul> </div> <devsite-recommendations display="in-page" hidden yield> </devsite-recommendations> <devsite-thumb-rating position="footer"> </devsite-thumb-rating> <devsite-feedback position="footer" project-name="Privacy Sandbox" product-id="5335444" bucket="" context="" version="t-devsite-webserver-20241114-r00-rc02.464922260396498922" data-label="Send Feedback Button" track-type="feedback" track-name="sendFeedbackLink" track-metadata-position="footer" class="nocontent" disable-product-feedback project-icon="https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-logo.png" > <button> Send feedback </button> </devsite-feedback> <devsite-recommendations id="recommendations-link" yield></devsite-recommendations> <div class="devsite-floating-action-buttons"> </div> </article> <devsite-content-footer class="nocontent"> <p>Except as otherwise noted, the content of this page is licensed under the <a href="https://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution 4.0 License</a>, and code samples are licensed under the <a href="https://www.apache.org/licenses/LICENSE-2.0">Apache 2.0 License</a>. 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