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{"total_count": 40, "features": [{"id": 6366274495053824, "name": "Remove FencedFrame element and window.fence APIs", "summary": "Fenced frames are nested frames that embed content onto a page without the ability to share data between the fenced frame and its embedder. \n\nwindow.fence APIs include Fenced frames Ads reporting (FFAR) JS APIs that were created for privacy-safe ads reporting from FFs created using Protected Audience and SelectURL and getNestedConfigs() to support PA component ads. \n\nThis intent is for removing both of these. Fenced frames element removal will be two step as detailed below.\n\nWith the removal (or stub API replacement) of PA and selectURL, FFs can no longer be navigated and thus it is safe to remove them. Fenced frames are only able to be navigated using the urn:uuid in a FencedFrameConfig[1], which can only be created using the return values from runAdAuction and selectURL. These APIs are being deprecated and removed in M152 as per the following Intent threads: Protected Audience[2], Shared Storage[3]. \n\nPlan:\nGiven that the fenced frames element can no longer be navigated, we propose removing the element from the code in the following phases:\n\n1. M156: Keep the fenced frame element and its associated IDL dependencies as stubs. This is to ensure no JS call throws, e.g.calling fenced-frame-element.config.setSharedStorageContext(). \n\n2. M156: In the same milestone we will also stub the window.fence APIs completely. Since there is no FF document navigation, these APIs cannot be invoked anymore, so it will be a no-op.\n\n3. M157 Canary/Beta: Begin a controlled rollout of the stub FF HTML element removal via a field trial. Note that removing the element will resolve it to HTMLUnknownElement. \n\nAt this point we are requesting approvals for all of the above steps.\n\n4. M157 Stable: Assuming there are no regressions or breakage after reaching 1% stable, we will request additional approval for full removal of the FF element. \n\n[1]https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/core/html/fenced_frame/fenced_frame_config.idl\n[2]https://groups.google.com/a/chromium.org/g/blink-dev/c/k_nubsMb97g/m/awPD4IGLBAAJ\n[3]https://groups.google.com/a/chromium.org/g/blink-dev/c/uh5Ke6qyegc/m/WFTFnhyJBAAJ\n\n", "markdown_fields": [], "blink_components": ["Blink>FencedFrames"], "star_count": 46, "search_tags": [], "created": {"by": "shivanisha@chromium.org", "when": "2026-07-24 20:11:58.616830"}, "updated": {"by": "shivanisha@chromium.org", "when": "2026-09-24 15:41:15.420605"}, "category": "Miscellaneous", "category_int": 2, "feature_notes": null, "web_feature": null, "is_official_web_feature": null, "webdx_usecounter_enum": null, "enterprise_feature_categories": [], "enterprise_product_category": 0, 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"rollout_impact": 2, "rollout_stage_plan": null, "enterprise_policies": [], "desktop_first": null, "android_first": null, "ios_first": null, "webview_first": null, "desktop_last": null, "android_last": null, "ios_last": null, "webview_last": null}], "accurate_as_of": "2026-09-24 15:41:15.420605", "creator_email": "shivanisha@chromium.org", "updater_email": "shivanisha@chromium.org", "owner_emails": ["shivanisha@chromium.org", "jkarlin@chromium.org", "skmanickam@google.com"], "editor_emails": ["averge@chromium.org", "xiaochenzh@chromium.org"], "cc_emails": [], "spec_mentor_emails": [], "unlisted": false, "deleted": false, "editors": ["averge@chromium.org", "xiaochenzh@chromium.org"], "cc_recipients": [], "spec_mentors": [], "creator": "shivanisha@chromium.org", "feature_type": "Feature removal", "feature_type_int": 3, "intent_stage": "None", "intent_stage_int": 0, "active_stage_id": 4940343960272896, "bug_url": "https://issues.chromium.org/538634423", "launch_bug_url": null, "new_crbug_url": "https://bugs.chromium.org/p/chromium/issues/entry?components=Blink>FencedFrames&blocking=538634423&cc=shivanisha@chromium.org,jkarlin@chromium.org,skmanickam@google.com", "screenshot_links": [], "first_enterprise_notification_milestone": null, "enterprise_impact": 1, "breaking_change": false, "confidential": false, "shipping_year": 2026, "flag_name": null, "finch_name": null, "non_finch_justification": null, "ongoing_constraints": null, "rollout_plan": 0, "rollout_plan_displayname": "Will ship enabled for all users", "motivation": "As described in the summary section, since fenced frames are no longer able to be navigated to a document, once PA and selectURL are removed, we should also remove FFs API for code health and to remove unused APIs from the web platform.", "devtrial_instructions": null, "activation_risks": null, "measurement": null, "availability_expectation": null, "adoption_expectation": null, "adoption_plan": null, "initial_public_proposal_url": null, 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But there may be minor inconsistencies b/w FF element and HTMLUnknownElement, e.g. their default size so we plan to keep FF element as a stub and remove the stub via field trial.", "all_platforms": true, "all_platforms_descr": null, "non_oss_deps": null, "anticipated_spec_changes": null, "security_risks": null, "ergonomics_risks": null, "wpt": true, "wpt_descr": null, "webview_risks": null, "devrel_emails": ["devrel-chromestatus-all@google.com"], "debuggability": "We will add an issue to dev tools when FF is converted to a stub element, whenever a FF element is created, that they will be removed shortly.", "doc_links": [], "sample_links": [], "prefixed": null, "tags": [], "tag_review": null, "tag_review_status": "Not applicable", "tag_review_status_int": 4, "security_review_status": "Issues addressed", "security_review_status_int": 3, "privacy_review_status": "Issues addressed", "privacy_review_status_int": 3, "security_continuity_id": null, "security_launch_issue_id": null, 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The renderSize field of the browserSignals argument to the scoreAd function.\n2. The requestedSize field of the browserSignals argument to the generateBid function.\n\nThe issues are:\n\n1. The explainer states that the scoreAd function has a parameter browserSignals, which contains an optional field renderSize. However, this renderSize field is not implemented. It is also missing from the spec.\n2. The requestedSize field has already been implemented but it is missing from the spec.\n3. The explainer contains code examples for the renderSize field. However, in the code example, the renderSize field only shows numeric values for its width and height. This is incorrect because it should have the units appended.\n4. Similarly, the explainer contains code examples for the requestedSize field. However, in the code example, the requestedSize field only shows numeric values for its width and height. This is incorrect because it should have the units appended.\n\nThe item fixes all three issues.\n\n1. Implement the renderSize field behind a default disabled flag: \"RenderSizeInScoreAdBrowserSignals\". Add this field to spec.\n2. Add requestedSize to the spec.\n3. Update the explainer for renderSize.\n4. 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This is incorrect because it should have the units appended.", "devtrial_instructions": null, "activation_risks": null, "measurement": null, "availability_expectation": null, "adoption_expectation": null, "adoption_plan": null, "initial_public_proposal_url": null, "explainer_links": [], "requires_embedder_support": false, "spec_link": "https://github.com/WICG/turtledove/pull/1141", "api_spec": true, "automation_spec": false, "interop_compat_risks": null, "all_platforms": null, "all_platforms_descr": "Supported on all six Blink platforms except Android WebView.", "non_oss_deps": null, "anticipated_spec_changes": "None", "security_risks": null, "ergonomics_risks": null, "wpt": true, "wpt_descr": "It is tested by third_party/blink/web_tests/external/wpt/fledge/tentative/score-ad-browser-signals.https.window.js.", "webview_risks": null, "devrel_emails": ["devrel-chromestatus-all@google.com"], "debuggability": "Additional debugging capabilities are not necessary for these feature changes.", "doc_links": ["https://github.com/WICG/turtledove/blob/main/FLEDGE", "https://github.com/WICG/turtledove/blob/main/FLEDGE.md#23-scoring-bids", "https://github.com/WICG/turtledove/pull/1145", "https://github.com/WICG/turtledove/pull/1141"], "sample_links": [], "prefixed": null, "tags": [], "tag_review": null, "tag_review_status": "Not applicable", "tag_review_status_int": 4, "security_review_status": "Pending", "security_review_status_int": 1, "privacy_review_status": "Pending", "privacy_review_status_int": 1, "security_continuity_id": null, "security_launch_issue_id": null, "updated_display": "2025-02-04", "resources": {"samples": [], "docs": ["https://github.com/WICG/turtledove/blob/main/FLEDGE", "https://github.com/WICG/turtledove/blob/main/FLEDGE.md#23-scoring-bids", "https://github.com/WICG/turtledove/pull/1145", "https://github.com/WICG/turtledove/pull/1141"]}, "comments": null, "ff_views": 5, "safari_views": 5, "web_dev_views": 4, "browsers": {"chrome": {"bug": "https://issues.chromium.org/u/1/issues/333628467", "blink_components": ["Blink>InterestGroups"], "devrel": ["devrel-chromestatus-all@google.com"], "owners": ["xiaochenzh@google.com"], "origintrial": false, "prefixed": null, "flag": false, "status": {"text": "In development", "val": 3, "milestone_str": "In development"}, "announced": false, "desktop": null, "android": null, "webview": null, "ios": null}, "ff": {"view": {"url": null, "notes": null, "text": "No signal", "val": 5}}, "safari": {"view": {"url": null, "notes": null, "text": "No signal", "val": 5}}, "webdev": {"view": {"text": "No signals", "val": 4, "url": null, "notes": null}}, "other": {"view": {"text": null, "val": null, "url": null, "notes": null}}}, "standards": {"spec": "https://github.com/WICG/turtledove/pull/1141", "maturity": {"text": "Unknown standards status - check spec link for status", "short_text": "Unknown status", "val": 1}}, "is_released": false, "is_enterprise_feature": false, "experiment_timeline": null, "ai_test_eval_report": null, "ai_test_eval_run_status": null, "ai_test_eval_status_timestamp": null}, {"id": 5095020001755136, "name": "Protected Audience: reporting timeouts & multiple-bids", "summary": "Protected Audience (PA) reporting timeouts:\r\nAfter a PA auction finishes selecting an ad and that ad is allowed to start rendering, the browser then runs a JavaScript function from the seller(s) and winning buyer to assemble reports that are sent back to their servers. These functions are currently given 50ms to run, after which they're aborted. We've heard feedback from users of the API that 50ms may not be sufficient to assemble the reports and may result in broken billing and other basic functionality, resulting in lower website revenue.  We\u2019re proposing making the timeout configurable up to 5s.\r\n\r\nProtected Audience multiple-bids:\r\nPresently buyers participating in PA ad selection auctions are only allowed to return one bid per interest group stored on a user's device. This has a couple downsides:\r\n1. When that one bid does not pass the k-anonymity threshold, the bid generation logic must be invoked again which can be slow, potentially doubling auction runtime.\r\n2. This preferences adtechs that store more interest groups on device as a way to get more bids into the auction. Many interest groups on device is something we publicly have stated is undesirable: https://developers.google.com/privacy-sandbox/relevance/protected-audience-api/latency#fewer_interest_group_owners\r\nTo fix this we're allowing bidding scripts to return multiple bids.", "markdown_fields": [], "blink_components": ["Blink>InterestGroups"], "star_count": 32, "search_tags": [], "created": {"by": "pauljensen@chromium.org", "when": "2024-03-28 18:27:44.634477"}, "updated": {"by": "pauljensen@chromium.org", "when": "2024-04-23 19:50:49.223814"}, "category": "Miscellaneous", "category_int": 2, "feature_notes": null, "web_feature": null, "is_official_web_feature": null, "webdx_usecounter_enum": null, "enterprise_feature_categories": [], "enterprise_product_category": 0, "is_releasenotes_content_reviewed": false, "is_releasenotes_publish_ready": false, "stages": [{"id": 6258291090128896, "created": "2024-03-28 18:27:44.878962", "feature_id": 5095020001755136, "stage_type": 110, "display_name": 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auction config", "summary": "Split up large trusted signals fetches:\r\nDuring Protected Audience auctions the browser fetches real-time signals from buyers' and sellers' key-value servers. These fetches are currently HTTP GET requests with URLs that the browser assembles by concatenating several individual requests together. The URLs can however grow larger than CDNs support resulting in failing requests and reduced website ad revenue. The proposal here is for buyers and sellers to specify the maximum size of these URLs and for the browser to only concatenate multiple requests together if it stays below the maximum sizes.\r\n\r\ndeprectedReplaceInURN via auction config:\r\nProtected Audience ad selection auctions return an opaque URN or FencedFrameConfig that can be used to display the selected ad creative. To facilitate adoption, until at least 2026, we agreed to support an API called deprecatedReplaceInURN() that allows replacing macros in the ad creative URL with information from the page where the ad will be displayed. Today, this API\u2019s ergonomics are not great for component sellers (i.e. sellers other than the top-level seller), and this API is useful for better supporting video ads, some brand safety checks and other use cases. 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Lastly, this effort brings the Privacy Sandbox Chrome and Android ecosystems to a shared enrollment process, which ensures you won't have to duplicate verification efforts across platforms.", "devtrial_instructions": null, "activation_risks": null, "measurement": null, "availability_expectation": "Feature is available only in Chromium browsers for the foreseeable future.", "adoption_expectation": null, "adoption_plan": null, "initial_public_proposal_url": "https://github.com/privacysandbox/attestation/blob/main/README.md", "explainer_links": ["https://developer.chrome.com/blog/announce-enrollment-privacy-sandbox"], "requires_embedder_support": true, "spec_link": null, "api_spec": false, "automation_spec": false, "interop_compat_risks": null, "all_platforms": null, "all_platforms_descr": null, "non_oss_deps": null, "anticipated_spec_changes": "None", "security_risks": null, "ergonomics_risks": null, "wpt": null, "wpt_descr": null, "webview_risks": "Not applicable", "devrel_emails": ["devrel-chromestatus-all@google.com"], "debuggability": "Console errors: The API surfaces gated on enrollment and attestation will output relevant console error messages if a given site is not allowed to participate/invoke those API surfaces. (Private Aggregation API-related console messages are output during its consumer API enrollment checks e.g. Shared Storage, but could be made more specific in the future).\n\nLocal override: For local testing, we are providing developer overrides with a Chrome flag and CLI switch:\n\nFlag: chrome://flags/#privacy-sandbox-enrollment-overrides\n\nCLI: --privacy-sandbox-enrollment-overrides=https://example.com,https://example.co.uk,...", "doc_links": [], "sample_links": [], "prefixed": null, "tags": [], "tag_review": "Private Aggregation (https://github.com/w3ctag/design-reviews/issues/846#issuecomment-1690139513)\n\nShared Storage (https://github.com/w3ctag/design-reviews/issues/747#issuecomment-1690156498)\n\nTopics (https://github.com/w3ctag/design-reviews/issues/726#issuecomment-1690087586)\n\nAttribution reporting API (https://github.com/w3ctag/design-reviews/issues/724#issuecomment-1690076332)\n\nProtected Audience (https://github.com/w3ctag/design-reviews/issues/723#issuecomment-1690413217)", "tag_review_status": "Pending", "tag_review_status_int": 1, "security_review_status": "Pending", "security_review_status_int": 1, "privacy_review_status": "Pending", "privacy_review_status_int": 1, "security_continuity_id": null, "security_launch_issue_id": null, "updated_display": "2023-09-08", "resources": {"samples": [], "docs": []}, "comments": null, "ff_views": 5, "safari_views": 5, "web_dev_views": 4, "browsers": {"chrome": {"bug": "https://crbug.com/1448875", "blink_components": ["Blink"], "devrel": ["devrel-chromestatus-all@google.com"], "owners": ["mikipatel@google.com", "shivanisha@chromium.org", "jkarlin@google.com"], "origintrial": false, "prefixed": null, "flag": false, "status": {"text": "In development", "val": 3, "milestone_str": "In development"}, "announced": true, "desktop": 118, "android": 118, "webview": null, "ios": null}, "ff": {"view": {"url": null, "notes": null, "text": "No signal", "val": 5}}, "safari": {"view": {"url": null, "notes": null, "text": "No signal", "val": 5}}, "webdev": {"view": {"text": "No signals", "val": 4, "url": null, "notes": null}}, "other": {"view": {"text": null, "val": null, "url": null, "notes": null}}}, "standards": {"spec": null, "maturity": {"text": null, "short_text": "Unknown status", "val": 0}}, "is_released": false, "is_enterprise_feature": false, "experiment_timeline": null, "ai_test_eval_report": null, "ai_test_eval_run_status": null, "ai_test_eval_status_timestamp": null}, {"id": 5140606359175168, "name": "Fenced Frames M120 functionality updates", "summary": "1) Additional format option for Protected Audience ad size macros\nIn the Protected Audience API within the Privacy Sandbox, there is an opt-in feature that allows you to macro the size of the ad that wins the auction into the ad\u2019s url, like:\n\nhttps://ad.com?width={%AD_WIDTH%}&height={%AD_HEIGHT%}\n\n(See https://github.com/WICG/turtledove/pull/417 for more details.)\n\nTo be more consistent with other types of macros in Protected Audience, like those used by deprecatedReplaceInURN and registerAdMacro, in M120 we\u2019re adding the ability to use ${AD_WIDTH} and ${AD_HEIGHT} as the format for the macros in addition to the current format.\n\n2) Automatic beacons will now send to all registered URLs.\n\nPreviously, only destinations specified when calling setReportEventDataForAutomaticBeacons() receive automatic beacons, even if that destination called registerAdBeacon() for \"reserved.top_navigation\" in their worklet. Now, any destination that called registerAdBeacon() for \"reserved.top_navigation\" will get an automatic beacon, but only destinations specified in setReportEventDataForAutomaticBeacons() will get automatic beacon data along with the beacon.\n\nThe \"once\" parameter in setReportEventDataForAutomaticBeacons() will now determine whether the data is sent out once, rather than determine if the entire beacon is sent once.", "markdown_fields": [], "blink_components": ["Blink>FencedFrames"], "star_count": 44, "search_tags": [], "created": {"by": "gtanzer@chromium.org", "when": "2023-09-06 14:39:02.647847"}, "updated": {"by": "foolip@google.com", "when": "2025-08-22 08:28:22.207729"}, "category": "Miscellaneous", "category_int": 2, "feature_notes": null, "web_feature": "fencedframe", "is_official_web_feature": true, "webdx_usecounter_enum": null, "enterprise_feature_categories": [], "enterprise_product_category": 0, "is_releasenotes_content_reviewed": false, "is_releasenotes_publish_ready": 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