Cookies Having Independent Partitioned State (CHIPS) | Privacy Sandbox

<!doctype html> <html lang="en" dir="ltr"> <head> <meta name="google-signin-client-id" content="721724668570-nbkv1cfusk7kk4eni4pjvepaus73b13t.apps.googleusercontent.com"> <meta name="google-signin-scope" content="profile email https://www.googleapis.com/auth/developerprofiles https://www.googleapis.com/auth/developerprofiles.award"> <meta property="og:site_name" content="Google for Developers"> <meta property="og:type" content="website"><meta name="theme-color" content="#fff"><meta charset="utf-8"> <meta content="IE=Edge" http-equiv="X-UA-Compatible"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="manifest" href="/_pwa/developers/manifest.json" crossorigin="use-credentials"> <link rel="preconnect" href="//www.gstatic.com" crossorigin> <link rel="preconnect" href="//fonts.gstatic.com" crossorigin> <link rel="preconnect" href="//fonts.googleapis.com" crossorigin> <link rel="preconnect" href="//apis.google.com" crossorigin> <link rel="preconnect" href="//www.google-analytics.com" crossorigin><link rel="stylesheet" href="//fonts.googleapis.com/css?family=Google+Sans:400,500|Roboto:400,400italic,500,500italic,700,700italic|Roboto+Mono:400,500,700&display=swap"> <link rel="stylesheet" href="//fonts.googleapis.com/css2?family=Material+Icons&family=Material+Symbols+Outlined&display=block"><link rel="stylesheet" href="https://www.gstatic.com/devrel-devsite/prod/v870e399c64f7c43c99a3043db4b3a74327bb93d0914e84a0c3dba90bbfd67625/developers/css/app.css"> <link rel="shortcut icon" href="https://www.gstatic.com/devrel-devsite/prod/v870e399c64f7c43c99a3043db4b3a74327bb93d0914e84a0c3dba90bbfd67625/developers/images/favicon-new.png"> <link rel="apple-touch-icon" href="https://www.gstatic.com/devrel-devsite/prod/v870e399c64f7c43c99a3043db4b3a74327bb93d0914e84a0c3dba90bbfd67625/developers/images/touchicon-180-new.png"><link rel="canonical" href="https://developers.google.com/privacy-sandbox/cookies/chips"><link rel="search" type="application/opensearchdescription+xml" title="Google for Developers" href="https://developers.google.com/s/opensearch.xml"> <link rel="alternate" hreflang="en" href="https://developers.google.com/privacy-sandbox/cookies/chips" /><link rel="alternate" hreflang="x-default" href="https://developers.google.com/privacy-sandbox/cookies/chips" /><link rel="alternate" hreflang="ar" href="https://developers.google.com/privacy-sandbox/cookies/chips?hl=ar" /><link rel="alternate" hreflang="bn" href="https://developers.google.com/privacy-sandbox/cookies/chips?hl=bn" /><link rel="alternate" hreflang="zh-Hans" href="https://developers.google.com/privacy-sandbox/cookies/chips?hl=zh-cn" /><link rel="alternate" hreflang="zh-Hant" href="https://developers.google.com/privacy-sandbox/cookies/chips?hl=zh-tw" /><link rel="alternate" hreflang="fa" href="https://developers.google.com/privacy-sandbox/cookies/chips?hl=fa" /><link rel="alternate" hreflang="fr" href="https://developers.google.com/privacy-sandbox/cookies/chips?hl=fr" /><link rel="alternate" hreflang="de" href="https://developers.google.com/privacy-sandbox/cookies/chips?hl=de" /><link rel="alternate" hreflang="he" href="https://developers.google.com/privacy-sandbox/cookies/chips?hl=he" /><link rel="alternate" hreflang="hi" href="https://developers.google.com/privacy-sandbox/cookies/chips?hl=hi" /><link rel="alternate" hreflang="id" href="https://developers.google.com/privacy-sandbox/cookies/chips?hl=id" /><link rel="alternate" hreflang="it" href="https://developers.google.com/privacy-sandbox/cookies/chips?hl=it" /><link rel="alternate" hreflang="ja" href="https://developers.google.com/privacy-sandbox/cookies/chips?hl=ja" /><link rel="alternate" hreflang="ko" href="https://developers.google.com/privacy-sandbox/cookies/chips?hl=ko" /><link rel="alternate" hreflang="pl" href="https://developers.google.com/privacy-sandbox/cookies/chips?hl=pl" /><link rel="alternate" hreflang="pt-BR" href="https://developers.google.com/privacy-sandbox/cookies/chips?hl=pt-br" /><link rel="alternate" hreflang="ru" href="https://developers.google.com/privacy-sandbox/cookies/chips?hl=ru" /><link rel="alternate" hreflang="es-419" href="https://developers.google.com/privacy-sandbox/cookies/chips?hl=es-419" /><link rel="alternate" hreflang="th" href="https://developers.google.com/privacy-sandbox/cookies/chips?hl=th" /><link rel="alternate" hreflang="tr" href="https://developers.google.com/privacy-sandbox/cookies/chips?hl=tr" /><link rel="alternate" hreflang="vi" href="https://developers.google.com/privacy-sandbox/cookies/chips?hl=vi" /><title>Cookies Having Independent Partitioned State (CHIPS)  |  Privacy Sandbox  |  Google for Developers</title> <meta property="og:title" content="Cookies Having Independent Partitioned State (CHIPS)  |  Privacy Sandbox  |  Google for Developers"><meta name="description" content="Allow developers to opt-in a cookie to partitioned storage, with a separate cookie jar per top-level site. Partitioned cookies can be set by a third-party service, but only read within the context of the top-level site where they were initially set."> <meta property="og:description" content="Allow developers to opt-in a cookie to partitioned storage, with a separate cookie jar per top-level site. Partitioned cookies can be set by a third-party service, but only read within the context of the top-level site where they were initially set."><meta property="og:url" content="https://developers.google.com/privacy-sandbox/cookies/chips"><meta property="og:image" content="https://developers.google.com/static/privacy-sandbox/assets/images/privacy-sandbox-for-developers.png"> <meta property="og:image:width" content="1600"> <meta property="og:image:height" content="900"><meta property="og:locale" content="en"><meta name="twitter:card" content="summary_large_image"><script type="application/ld+json"> { "@context": "https://schema.org", "@type": "Article", "dateModified": "2023-12-15", "headline": "Cookies Having Independent Partitioned State (CHIPS)" } </script><script type="application/ld+json"> { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [{ "@type": "ListItem", "position": 1, "name": "Privacy Sandbox", "item": "https://developers.google.com/privacy-sandbox" },{ "@type": "ListItem", "position": 2, "name": "Cookies Having Independent Partitioned State (CHIPS)", "item": "https://developers.google.com/privacy-sandbox/cookies/chips" }] } </script> <link rel="stylesheet" href="/extras.css"></head> <body class="" template="page" theme="white" type="article" layout="docs" concierge='closed' display-toc pending> <devsite-progress type="indeterminate" id="app-progress"></devsite-progress> <section class="devsite-wrapper"> <devsite-cookie-notification-bar></devsite-cookie-notification-bar><devsite-header 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, 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 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-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"> Cookies Having Independent Partitioned State (CHIPS) </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>Allow developers to opt a cookie in to "partitioned" storage, with a separate cookie jar per top-level site.</p> <p><devsite-video video-id="zYp0DFFmGxk"></devsite-video></p> <h2 id="implementation_status" data-text="Implementation status" tabindex="-1">Implementation status</h2> <p><style> .wd-browser-compat { --icon-size: 1.5em; -webkit-box-align: center; -webkit-align-items: center; -moz-box-align: center; -ms-flex-align: center; align-items: center; display: -webkit-box; display: -webkit-flex; display: -moz-box; display: -ms-flexbox; display: flex; -webkit-box-orient: horizontal; -webkit-box-direction: normal; -webkit-flex-direction: row; -moz-box-orient: horizontal; -moz-box-direction: normal; -ms-flex-direction: row; flex-flow: row wrap; line-height: var(--icon-size); } .wd-browser-compat ul { display: -webkit-box; display: -webkit-flex; display: -moz-box; display: -ms-flexbox; display: flex; flex-wrap: nowrap; gap: 1em; list-style: none; padding-inline: 1em; } .wd-browser-compat li { background-position: 50% 50%; background-repeat: no-repeat; border-radius: 1em; height: calc(var(--icon-size) + 0.4em); line-height: calc(var(--icon-size) + 0.4em); margin-left: 2em; min-width: var(--icon-size); padding-inline: 0.4em; text-align: center; vertical-align: middle; } .wd-browser-compat img { vertical-align: middle; } .wd-browser-compat [data-support=yes] { background: #e0f2f1; color: #00796b } .wd-browser-compat [data-support=no] { background: #fce8e6; color: #a50e0e } </style> <div class="wd-browser-compat"> <p>Browser Support</p> <ul> <li data-support="yes"> <img alt="Chrome: 114." src="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='-10 -10 276 276'%3E%3ClinearGradient id='a' x1='145' 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and higher</a>.</li> <li>An origin trial, now complete, was available from Chrome 100 to 116.</li> <li>Read the <a href="https://groups.google.com/a/chromium.org/g/blink-dev/c/_dJFNJpf91U">Intent to Experiment</a> and <a href="https://groups.google.com/a/chromium.org/g/blink-dev/c/JNOQvsTxecI/m/V-OewM3lAwAJ">Intent to Ship</a>.</li> </ul> <aside> For information about CHIPS and Android WebView, see the <a href="https://groups.google.com/a/chromium.org/g/blink-dev/c/_hHg5MASz4s">Intent to Deprecate and Relaunch: CHIPS on WebView</a>. </aside> <h2 id="what_is_chips" data-text="What is CHIPS?" tabindex="-1">What is CHIPS?</h2> <p>Cookies Having Independent Partitioned State (CHIPS) allows developers to opt a cookie into partitioned storage, with separate cookie jars per top-level site, improving user privacy and security.</p> <p>Without partitioning, third-party cookies can enable services to track users and join their information from across many unrelated top-level sites. This is known as cross-site tracking.</p> <p>CHIPS, the <a href="/privacy-sandbox/cookies/storage-access-api">Storage Access API</a>, and <a href="/privacy-sandbox/cookies/related-website-sets">Related Website Sets</a> are the only way to read and write cookies from cross-site contexts, such as iframes, when third-party cookies are blocked.</p> <figure> <img src="/static/privacy-sandbox/assets/images/without-cookie-partitioni-bb0cbbf0c63d.png" alt="Diagram showing how cookes can be shared between two different web sites." width="800" height="450"> <figcaption>Without cookie partitioning, a third-party service can set a cookie when embedded in one top-level site and access that same cookie when the service is embedded in other top-level sites.</figcaption> </figure> <p>CHIPS introduces a new cookie attribute, <code translate="no" dir="ltr">Partitioned</code>, to support cross-site cookies that are partitioned by top-level context.</p> <p>Set-Cookie header:</p> <pre class="prettyprint lang-http" translate="no" dir="ltr"><code translate="no" dir="ltr">Set-Cookie: __Host-name=value; Secure; Path=/; SameSite=None; Partitioned; </code></pre> <p>Javascript:</p> <pre class="prettyprint lang-js" translate="no" dir="ltr"><code translate="no" dir="ltr">document.cookie="__Host-name=value; Secure; Path=/; SameSite=None; Partitioned;" </code></pre> <p>A partitioned third-party cookie is tied to the top-level site where it's initially set and cannot be accessed from elsewhere. This way cookies set by a third-party service can only be read within the same embedded context of the top-level site where they were initially set.</p> <figure> <img src="/static/privacy-sandbox/assets/images/with-cookie-partitioning-d3df97804f836.png" alt="Diagram showing that two different web sites embedding a common third-party will no longer share cookies for that third-party." width="800" height="443"> <figcaption>With cookie partitioning, a third-party service that sets a cookie when embedded in one top-level site cannot access that same cookie when the service is embedded in other top-level sites.</figcaption> </figure> <p>With partitioned cookies, when a user visits site A and embedded content from site C sets a cookie with the Partitioned attribute, the cookie is saved in a partitioned jar designated only for cookies that the site C sets when it's embedded on site A. The browser will only send that cookie when the top-level site is A.</p> <p>When the user visits a new site, for example site B, an embedded C frame won't receive the cookie that was set when C was embedded in site A.</p> <p>If a user visits site C as a top level website, the partitioned cookie that C set when it was embedded in A won't be sent in that request either.</p> <figure> <img src="/static/privacy-sandbox/assets/images/with-cookie-partitioning-a19ff8bdd6d0d.png" alt="Diagram showing that cookies are not shared when the same third-party is embedded on two different web sites." width="400" height="304"> <figcaption>With cookie partitioning, a third-party service that sets a cookie when embedded in a site cannot access that same cookie even when the users visits the service as top-level site.</figcaption> </figure> <h2 id="use_cases" data-text="Use cases" tabindex="-1">Use cases</h2> <p>For example, the site <code translate="no" dir="ltr">retail.example</code> may want to work with a third-party service <code translate="no" dir="ltr">support.chat.example</code> to embed a support chat box on its site. Many embeddable chat services today rely on cookies to save state.</p> <figure> <img src="/static/privacy-sandbox/assets/images/top-level-site-retailexa-b1bf622bc028e.png" alt="Diagram showing a web site with an embeeded chat widget" width="400" height="310"> <figcaption>Top-level site retail.example embedding a third-party service <code translate="no" dir="ltr">support.chat.example</code>.</figcaption> </figure> <p>Without the ability to set a cross-site cookie, <code translate="no" dir="ltr">support.chat.example</code> would need to find alternative, often more complex, methods to store state. Alternatively, it would need to be embedded in the top-level page which introduces risks because it allows the <code translate="no" dir="ltr">support.chat.example</code> script to have elevated privileges on retail.example, such as the ability to access authentication cookies.</p> <p>CHIPS provides an easier option to continue to use cross-site cookies, without the risks associated with unpartitioned cookies.</p> <p>Example use cases for CHIPS include any scenarios where cross-site subresources require some notion of session or persistent state that is scoped to a user's activity on a single top-level site, such as:</p> <ul> <li>Third-party chat embeds</li> <li>Third-party map embeds</li> <li>Third-party payment embeds</li> <li>Subresource CDN load balancing</li> <li>Headless CMS providers</li> <li>Sandbox domains for serving untrusted user content (such as googleusercontent.com and githubusercontent.com)</li> <li>Third-party CDNs that use cookies to serve content that's access-controlled by the authentication status on the first-party site (for example, profile pictures on social media sites hosted on third-party CDNs)</li> <li>Front-end frameworks that rely on remote APIs using cookies on their requests</li> <li>Embedded ads that need state scoped per publisher (for example, capturing users' ads preferences for that website)</li> </ul> <h2 id="why_chips_uses_an_opt-in_partitioning_model" data-text="Why CHIPS uses an opt-in partitioning model" tabindex="-1">Why CHIPS uses an opt-in partitioning model</h2> <p>Where access to unpartitioned third-party cookies is blocked, a couple of other approaches to partitioning have been attempted.</p> <p>Firefox announced that they are <a href="https://hacks.mozilla.org/2021/02/introducing-state-partitioning/">partitioning all third-party cookies by default</a> in their ETP Strict mode and private browsing mode, so all cross-site cookies are partitioned by the top-level site. However, partitioning cookies without a third-party opt-in can lead to unexpected bugs, since some third-party services have built servers which expect an unpartitioned third-party cookie.</p> <p><a href="https://webkit.org/blog/8613/intelligent-tracking-prevention-2-1/">Safari previously tried partitioning cookies based on heuristics</a>, but eventually chose to block them altogether, citing developer confusion as one of the reasons. Recently, <a href="https://github.com/privacycg/storage-access/issues/75">Safari expressed interest in an opt-in based model</a>.</p> <p>What sets CHIPS apart from existing implementations of partitioned cookies is the third-party opt-in. Cookies must be set with a new attribute in order to be sent on cross-party requests once (unpartitioned) third-party cookies are obsoleted.</p> <p>While third-party cookies still exist, the <code translate="no" dir="ltr">Partitioned</code> attribute provides an opt-in to a more restrictive, more secure type of cookie behavior. CHIPS is an important step to help services make a smooth transition to a future without third-party cookies.</p> <h2 id="cookie_partitioning_technical_design" data-text="Cookie partitioning technical design" tabindex="-1">Cookie partitioning technical design</h2> <p>Today, cookies are keyed on the hostname or domain of the site that set them, that is, their <em>host key</em>.</p> <p>For example, for cookies from <code translate="no" dir="ltr">https://support.chat.example</code>, the host key is <code translate="no" dir="ltr">("support.chat.example")</code>.</p> <p>Under CHIPS, cookies that opt into partitioning will be double-keyed on their host key and <em>partition key</em>.</p> <p>A <em>cookie's partition key</em> is the site (<a href="https://web.dev/articles/same-site-same-origin#%22schemeful_same_site%22">scheme and registrable domain</a>) of the top-level URL the browser was visiting at the start of the request to the endpoint that set the cookie.</p> <p>In the example earlier, where <code translate="no" dir="ltr">https://support.chat.example</code> is embedded on <code translate="no" dir="ltr">https://retail.example</code>, the top-level URL is <code translate="no" dir="ltr">https://retail.example</code>.</p> <p>The partition key in that case is <code translate="no" dir="ltr">("https", "retail.example")</code>.</p> <p>Likewise, a <em>request's partition key</em> is the site of the top-level URL the browser is visiting at the start of a request. Browsers must only send a cookie with the <code translate="no" dir="ltr">Partitioned</code> attribute in requests with the same partition key as that cookie.</p> <p>Here's what the cookie key in the example earlier looks like before and after CHIPS.</p> <figure> <img src="/static/privacy-sandbox/assets/images/site-and-embedded-site-b6ea4419a367f.png" alt="Site A and the embedded site C share a partitioned cookie. When not embedded, site C cannot access the partitioned cookie." width="800" height="204"> <figcaption>Site A and the embedded site C share a partitioned cookie. When not embedded, site C cannot access the partitioned cookie.</figcaption> </figure> <p><strong>Before CHIPS</strong></p> <pre class="prettyprint lang-text" translate="no" dir="ltr"><code translate="no" dir="ltr">key=("support.chat.example") </code></pre> <p><strong>After CHIPS</strong></p> <pre class="prettyprint lang-text" translate="no" dir="ltr"><code translate="no" dir="ltr">key={("support.chat.example"),("https", "retail.example")} </code></pre> <aside class="note"><strong>Note:</strong> Chrome has a limit of maximum 180 cookies per partition that cannot exceed 10 KB per-embedded-site.</aside> <h2 id="security_design" data-text="Security design" tabindex="-1">Security design</h2> <p>To encourage good security practices, with CHIPS, cookies are only set by and sent over secure protocols.</p> <ul> <li>Partitioned cookies must be set with <code translate="no" dir="ltr">Secure</code>.</li> <li>It is recommended to use the <code translate="no" dir="ltr">__Host-</code> prefix when setting partitioned cookies to make them bound to the hostname (and not the registrable domain).</li> </ul> <p>Example:</p> <pre class="prettyprint lang-http" translate="no" dir="ltr"><code translate="no" dir="ltr">Set-Cookie: __Host-example=34d8g; SameSite=None; Secure; Path=/; Partitioned; </code></pre> <aside class="note"> <strong>Note:</strong> Adding <code translate="no" dir="ltr">SameSite=None</code> will allow your cookie to be sent in third-party contexts where the <code translate="no" dir="ltr">Partitioned</code> attribute is not supported, as long as third-party cookies are allowed in browser settings. </aside> <h2 id="alternatives_to_chips" data-text="Alternatives to CHIPS" tabindex="-1">Alternatives to CHIPS</h2> <p>The <a href="/privacy-sandbox/cookies/storage-access-api">Storage Access API</a> and the associated <a href="/privacy-sandbox/cookies/related-website-sets-integration">Related Website Sets (RWS)</a> are web platform mechanisms to enable limited cross-site cookie access for specific, user-facing purposes.</p> <p>These are alternatives to CHIPS partitioning where access to cross-site, unpartitioned cookes is required.</p> <p>Consider the Storage Access API and Related Website Sets in situations where you need the same cookie to be available to a service that's embedded in multiple related sites.</p> <p>CHIPS provides the capability for a service to act as an isolated component across multiple sites, where the same cookie does not need to be available across multiple sites. If the service sets a partitioned cookie, its partition key will be the top-level site and that cookie won't be available to other sites also using the service.</p> <p>The Related Website Sets design relies on Storage Access API and does not integrate with CHIPS partitioning. If you have a use case that relies on a shared cookie partition across sites within a RWS you can <a href="https://github.com/WICG/first-party-sets/issues/94">provide examples and feedback on the GitHub issue</a>.</p> <h2 id="demo" data-text="Demo" tabindex="-1">Demo</h2> <p>This <a href="https://chips-site-a.glitch.me">demo</a> will walk you through how partitioned cookies work and how you can inspect them in DevTools.</p> <p>Site A embeds an iframe from Site B which uses JavaScript to set two cookies: a partitioned and unpartitioned cookie. Site B displays all cookies accessible from that location using <a href="https://developer.mozilla.org/docs/Web/API/Document/cookie"><code translate="no" dir="ltr">document.cookie</code></a>.</p> <p>When third-party cookies are blocked, site B will only be able to set and access the cookie with the <code translate="no" dir="ltr">Partitioned</code> attribute in cross-site context.</p> <p>When third-party cookies are allowed, site B is able to also set and access the unpartitioned cookie.</p> <figure> <img src="/static/privacy-sandbox/assets/images/3p-cookies-blocked-and-not-blocked.png" alt="Site A and site B" width="800" height="457"> <figcaption>Left: Third-party cookies are blocked. Right: Third-party cookies are allowed.</figcaption> </figure> <h3 id="prerequisites" data-text="Prerequisites" tabindex="-1">Prerequisites</h3> <ol> <li>Chrome 118 or higher.</li> <li>Visit <code translate="no" dir="ltr">chrome://flags/#test-third-party-cookie-phaseout</code> and enable this setting</li> </ol> <h3 id="use_devtools_to_inspect_partitioned_cookies" data-text="Use DevTools to inspect partitioned cookies" tabindex="-1">Use DevTools to inspect partitioned cookies</h3> <ol> <li>Visit <a href="https://chips-site-a.glitch.me">https://chips-site-a.glitch.me</a>.</li> <li>Press <code translate="no" dir="ltr">Control+Shift+J</code> (or <code translate="no" dir="ltr">Command+Option+J</code> on Mac) to open DevTools.</li> <li>Click the <strong>Application</strong> tab.</li> <li>Navigate to <strong>Application > Storage > Cookies</strong>.</li> <li>Click <code translate="no" dir="ltr">https://chips-site-b.glitch.me</code>.</li> </ol> <p>DevTools will display all the cookies from the selected origin.</p> <figure> <img src="/static/privacy-sandbox/assets/images/QcTVEgWjGYQZJtMX0g4a.png" alt width="800" height="263"> <figcaption>Cookies from site B in the DevTools Application tab.</figcaption> </figure> <p>Site B can only set the partitioned cookie in cross-site context, the unpartitioned cookie will be blocked:</p> <ul> <li>You should see <code translate="no" dir="ltr">__Host-partitioned-cookie</code> with the partition key of the top level site <code translate="no" dir="ltr">https://chips-site-a.glitch.me</code>.</li> </ul> <figure> <img src="/static/privacy-sandbox/assets/images/DvSAMie7T41SFBY7wUrc.png" alt width="800" height="52"> <figcaption>Partition key for __Host-partitioned-cookie.</figcaption> </figure> <aside class="note"><strong>Note:</strong> This view shows all cookies for that partition and any unparitioned cookies, even if they are not accessible in the current page. If you visit site B as a top level site, you would see the unpartitioned cookie here, but it wouldn't be available to site B when it's embedded on site A.</aside> <ol> <li>Click <strong>Go to Site B</strong>.</li> <li>In DevTools, navigate to <strong>Application > Storage > Cookies</strong>.</li> <li>Click <code translate="no" dir="ltr">https://chips-site-b.glitch.me</code>.</li> </ol> <figure> <img src="/static/privacy-sandbox/assets/images/site-b.png" alt="Site B" width="408" height="477"> <figcaption>At top-level, site B can see all the cookies - partitioned and not partitioned</figcaption> </figure> <p>In this scenario, because you are on site B in top-level context, it can set and access both cookies:</p> <ul> <li><code translate="no" dir="ltr">unpartitioned-cookie</code> has an empty partition key.</li> <li><code translate="no" dir="ltr">__Host-partitioned-cookie</code> cookie has the partition key <code translate="no" dir="ltr">https://chips-site-b.glitch.me</code>.</li> </ul> <figure> <img src="/static/privacy-sandbox/assets/images/vl4ouXXVqQ1bB5dEP4iK.png" alt width="800" height="245"> <figcaption>Cookies from site B in the DevTools Application tab when visiting B as a top-level site. __Host-partitioned-cookie has the partition key https://chips-site-b.glitch.me.</figcaption> </figure> <p>If you navigate back to site A, <code translate="no" dir="ltr">unpartitioned-cookie</code> is now stored in the browser, but it won't be accessible from site A.</p> <ol> <li>Click <strong>Go to Site A</strong>.</li> <li>Click the <strong>Network</strong> tab.</li> <li>Click <code translate="no" dir="ltr">https://chips-site-b.glitch.me</code>.</li> <li>Click the <strong>Cookies</strong> tab.</li> </ol> <p>While on site A, you should see the <code translate="no" dir="ltr">__Host-partitioned-cookie</code> with the partition key of the top level site <code translate="no" dir="ltr">https://chips-site-a.glitch.me</code>.</p> <figure> <img src="/static/privacy-sandbox/assets/images/223LlvPnqtMPoEjMASht.png" alt width="800" height="236"> <figcaption>Network tab showing cookies from site B iframe that are accessible when it's embedded on site A.</figcaption> </figure> <p>If you check <strong>show filtered out cookies requests</strong> DevTools will show that the unpartitioned cookie is blocked, highlighted in yellow with a tooltip: <em>"This cookie was blocked due to user preferences"</em>.</p> <figure> <img src="/static/privacy-sandbox/assets/images/a4jDguCgbwt9D5RB5Q6r.png" alt width="800" height="245"> <figcaption>Network tab showing blocked cookies from site B iframe.</figcaption> </figure> <aside class="note"><strong>Note:</strong> Because you visited B as a top-level site, site B also has a partitioned cookie with the partition key <code translate="no" dir="ltr">https://chips-site-b.glitch.me</code> that's not available to it in this context so you will see a message: <em>"This site has cookies in another partition that were not sent with this request".</em></aside> <p>In <strong>Application > Storage > Cookies</strong> clicking on <code translate="no" dir="ltr">https://chips-site-b.glitch.me</code> will show:</p> <ul> <li><code translate="no" dir="ltr">unpartitioned-cookie</code> with the empty partition key.</li> <li><code translate="no" dir="ltr">__Host-partitioned-cookie</code> cookie with the partition key <code translate="no" dir="ltr">https://chips-site-a.glitch.me</code>.</li> </ul> <figure> <img src="/static/privacy-sandbox/assets/images/tv3pAAoTktiX3nZdIUIh.png" alt width="800" height="257"> <figcaption>Cookies from site B in the DevTools Application tab. <code translate="no" dir="ltr">__Host-partitioned-cookie</code> cookie has the partition key <code translate="no" dir="ltr">https://chips-site-a.glitch.me</code>. <code translate="no" dir="ltr">unpartitioned-cookie</code> is shown, but it's not accessible to site B iframe when it's embedded on site A.</figcaption> </figure> <h3 id="clear_cookies" data-text="Clear cookies" tabindex="-1">Clear cookies</h3> <p>To reset the demo, clear all cookies for the site:</p> <ul> <li>Press <code translate="no" dir="ltr">Control+Shift+J</code> (or <code translate="no" dir="ltr">Command+Option+J</code> on Mac) to open DevTools.</li> <li>Click the <strong>Application</strong> tab.</li> <li>Navigate to <strong>Application > Storage > Cookies</strong>.</li> <li>Right-click on <code translate="no" dir="ltr">https://chips-site-b.glitch.me</code>.</li> <li>Click <strong>Clear</strong>.</li> </ul> <h2 id="resources" data-text="Resources" tabindex="-1">Resources</h2> <ul> <li><strong>GitHub</strong>: Read the <a href="https://github.com/WICG/CHIPS">explainer</a>, <a href="https://github.com/WICG/CHIPS/issues">raise questions and follow the discussion</a>.</li> <li><strong>Developer support</strong>: Ask questions and join discussions on the <a href="https://github.com/GoogleChromeLabs/privacy-sandbox-dev-support">Privacy Sandbox 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