FedCM: A trust signal for the Storage Access API in Chrome 131 | Privacy Sandbox

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storage. For example, if <code translate="no" dir="ltr">idp.example</code> is embedded on <code translate="no" dir="ltr">rp.example</code>, and <code translate="no" dir="ltr">idp.example</code> needs storage access to its own top-level cookie to show personalized content.</p> <p>In this scenario, the user needs to approve two different prompts: one for authentication and another to grant cookie access, as SAA would trigger a <a href="/privacy-sandbox/cookies/storage-access-api#permission-prompts">permission prompt</a>. FedCM simplifies the Storage Access API process by acting as a <a href="/privacy-sandbox/cookies/storage-access-api">trust signal</a>. Once the user logs in with FedCM, the IdP-initiated storage access requests are automatically granted, eliminating the need for additional SAA prompts.</p> <pre class="prettyprint lang-Javacript" translate="no" dir="ltr"><code translate="no" dir="ltr">// In top-level rp.example: // Ensure FedCM permission has been granted. const cred = await navigator.credentials.get({ identity: { providers: [{ configURL: 'https://idp.example/fedcm.json', clientId: '123', }], } }); // In an embedded IdP iframe: // Returns `true` if the user already has access to cookies, and `false` if // the user doesn't have access yet and needs to request it. const hasAccess = await document.hasStorageAccess() if(!hasAccess){ // No user gesture is needed to approve storage access, and the call will be auto-granted. document.requestStorageAccess().then(e=>{ //access cookies }) } else{ //the iframe already has access to third-party cookies } </code></pre> <p><a href="/privacy-sandbox/blog/fedcm-chrome-126-updates#storage-access-api">Origin trial</a> participants have provided positive feedback, highlighting the improved user experience enabled by a context-specific FedCM prompt over generic Storage Access API prompts.</p> <aside class="note"><strong>Note:</strong><span> If an RP calls <code translate="no" dir="ltr">navigator.credentials.preventSilentAccess()</code> to explicitly <a href="/privacy-sandbox/cookies/fedcm-developer-guide#prevent-silent-access"> disable auto-reauthentication</a>, storage access will also not be auto-granted until the user re-authenticates with FedCM again.</span></aside> <p>Learn more about using FedCM to auto-grant storage access in the <a href="/privacy-sandbox/cookies/storage-access-api">Storage Access API documentation</a>.</p> <h2 id="engage_and_provide_feedback" data-text="Engage and provide feedback" tabindex="-1">Engage and provide feedback</h2> <p>File an <a href="https://issues.chromium.org/issues/new?component=1456331&pli=1&template=1937104">issue</a> to share feedback or report problems. 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