Mark several privacy sandbox features as discouraged

features/attribution-reporting.yml

@@ -1,6 +1,12 @@
 name: Attribution reporting
-description: The Attribution Reporting API measures when an ad click or view leads to a conversion, such as a purchase on an advertiser site.
+description: The attribution reporting API measures when an ad click or view leads to a conversion, such as a purchase on an advertiser site.
 spec: https://wicg.github.io/attribution-reporting-api/
+discouraged:
+  removal_date: 2026-06-01 # Chrome 150
+  reason: Following the announcement that Chrome will maintain its current approach to third-party cookies, Chrome decided to withdraw certain Privacy Sandbox features including the attribution reporting API.
+  according_to:
+    - https://groups.google.com/a/chromium.org/g/blink-dev/c/4K2RRt6VYCQ
+    - https://chromestatus.com/feature/6320639375966208
 compat_features:
   - api.HTMLAnchorElement.attributionSrc
   - api.HTMLAreaElement.attributionSrc

features/related-website-sets.yml

@@ -0,0 +1,15 @@
+name: Related website sets
+description: Related website sets declares relationships between sites so the browser allows cookie and storage access between them through methods such as `document.requestStorageAccessFor()`.
+spec:
+  - https://wicg.github.io/first-party-sets/
+  - https://privacycg.github.io/requestStorageAccessFor/
+discouraged:
+  removal_date: 2026-06-01 # Chrome 150
+  reason: Following the announcement that Chrome will maintain its current approach to third-party cookies, Chrome decided to withdraw certain Privacy Sandbox features including the related website sets.
+  according_to:
+    - https://groups.google.com/a/chromium.org/g/blink-dev/c/V-wPXyoruac
+    - https://chromestatus.com/feature/5162221567082496
+    - https://chromestatus.com/feature/5194473869017088
+compat_features:
+  - api.Document.requestStorageAccessFor
+  - api.Permissions.permission_top-level-storage-access

features/related-website-sets.yml.dist

@@ -0,0 +1,23 @@
+# Generated from: related-website-sets.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: false
+  support:
+    chrome: "119"
+    chrome_android: "120"
+    edge: "119"
+compat_features:
+  # baseline: false
+  # support:
+  #   chrome: "113"
+  #   chrome_android: "120"
+  #   edge: "113"
+  - api.Permissions.permission_top-level-storage-access
+
+  # baseline: false
+  # support:
+  #   chrome: "119"
+  #   chrome_android: "119"
+  #   edge: "119"
+  - api.Document.requestStorageAccessFor

features/shared-storage-locks.yml

@@ -1,6 +1,12 @@
 name: Shared storage locks
 description: The `withLock` option to `set()`, `append()`, `delete()`, `clear()`, and `batchUpdate()` methods of the `sharedStorage` API prevents duplicate reporting from cross-site race conditions.
 spec: https://wicg.github.io/shared-storage/#web-locks-integration
+discouraged:
+  removal_date: 2026-06-01 # Chrome 150
+  reason: Following the announcement that Chrome will maintain its current approach to third-party cookies, Chrome decided to withdraw certain Privacy Sandbox features including shared storage locks.
+  according_to:
+    - https://groups.google.com/a/chromium.org/g/blink-dev/c/uh5Ke6qyegc
+    - https://chromestatus.com/feature/5076349064708096
 compat_features:
   - api.SharedStorage.batchUpdate
   - api.SharedStorageAppendMethod

features/shared-storage.yml

@@ -1,6 +1,12 @@
 name: Shared storage
 description: The `sharedStorage` API stores data to a shared space where the data can then be processed without the ability to track users across the different sites they visit. A common use case is measuring the reach of third-party ads without using user-tracking cookies."
 spec: https://wicg.github.io/shared-storage/
+discouraged:
+  removal_date: 2026-06-01 # Chrome 150
+  reason: Following the announcement that Chrome will maintain its current approach to third-party cookies, Chrome decided to withdraw certain Privacy Sandbox features including the shared storage.
+  according_to:
+    - https://groups.google.com/a/chromium.org/g/blink-dev/c/uh5Ke6qyegc
+    - https://chromestatus.com/feature/5076349064708096
 group:
   - storage
   - worklets

features/storage-access.yml

@@ -7,8 +7,6 @@ status:
 compat_features:
   - api.Document.hasStorageAccess
   - api.Document.requestStorageAccess
-  - api.Document.requestStorageAccessFor
   - api.Permissions.permission_storage-access
-  - api.Permissions.permission_top-level-storage-access
   - html.elements.iframe.allow.storage-access
   - http.headers.Permissions-Policy.storage-access

features/storage-access.yml.dist

@@ -43,17 +43,3 @@ compat_features:
   #   edge: "113"
   - html.elements.iframe.allow.storage-access
   - http.headers.Permissions-Policy.storage-access
-
-  # baseline: false
-  # support:
-  #   chrome: "113"
-  #   chrome_android: "120"
-  #   edge: "113"
-  - api.Permissions.permission_top-level-storage-access
-
-  # baseline: false
-  # support:
-  #   chrome: "119"
-  #   chrome_android: "119"
-  #   edge: "119"
-  - api.Document.requestStorageAccessFor

features/topics.yml

@@ -1,6 +1,12 @@
 name: Topics
-description: The Topics API reports a user's likely subject-matter interests (as determined by the browser, known as topics) to iframes. This allows for interest-based advertising that does not rely on user's exact browsing history, third-party cookies, or fingerprinting.
+description: The topics API reports a user's likely subject-matter interests (as determined by the browser, known as topics) to iframes. This allows for interest-based advertising that does not rely on user's exact browsing history, third-party cookies, or fingerprinting.
 spec: https://patcg-individual-drafts.github.io/topics/
+discouraged:
+  removal_date: 2026-06-01 # Chrome 150
+  reason: Following the announcement that Chrome will maintain its current approach to third-party cookies, Chrome decided to withdraw certain Privacy Sandbox features including the topics API.
+  according_to:
+    - https://groups.google.com/a/chromium.org/g/blink-dev/c/_R85yctz4Rs
+    - https://chromestatus.com/feature/5135370673061888
 compat_features:
   - api.Document.browsingTopics
   - html.elements.iframe.browsingtopics

index.ts

@@ -10,7 +10,7 @@ import { GroupData, SnapshotData, WebFeaturesData } from './types';
 import { BASELINE_LOW_TO_HIGH_DURATION, coreBrowserSet, getStatus, parseRangedDateString } from 'compute-baseline';
 import { Compat } from 'compute-baseline/browser-compat-data';
 import { assertRequiredRemovalDateSet, assertValidFeatureReference } from './assertions';
-import { isMoved, isSplit } from './type-guards';
+import { isMoved, isOrdinaryFeatureData, isSplit } from './type-guards';
 
 // The longest name allowed, to allow for compact display.
 const nameMaxLength = 80;
@@ -159,16 +159,25 @@ for (const [key, data] of yamlEntries('features')) {
         }
     }
 
-    // Convert markdown to text+HTML.
-    if (data.description) {
+    if (isOrdinaryFeatureData(data)) {
+        // Convert Markdown fields
+        const description = data.description as unknown;
+        if (typeof description !== "string" || description.trim().length === 0) {
+            throw new Error(`${key}.yml is missing a description value!`);
+        }
         const { text, html } = convertMarkdown(data.description);
         data.description = text;
         data.description_html = html;
-    }
-    if (data.discouraged) {
-        const { text, html } = convertMarkdown(data.discouraged.reason);
-        data.discouraged.reason = text;
-        data.discouraged.reason_html = html;
+
+        if ("discouraged" in data) {
+            const reason = data.discouraged.reason as unknown;
+            if (typeof reason !== "string" || reason.trim().length === 0) {
+                throw new Error(`${key}.yml is missing a discouraged reason value!`);
+            }
+            const { text, html } = convertMarkdown(data.discouraged.reason);
+            data.discouraged.reason = text;
+            data.discouraged.reason_html = html;
+        }
     }
 
     // Compute Baseline high date from low date.

text.ts

@@ -5,7 +5,11 @@ import remarkParse from "remark-parse";
 import remarkRehype from "remark-rehype";
 import { unified } from "unified";
 
-export function convertMarkdown(markdown: string) {
+export function convertMarkdown(markdown: unknown) {
+  if (typeof markdown !== "string") {
+    throw new Error(`${markdown} is not a string!`);
+  }
+
   const mdTree = unified().use(remarkParse).parse(markdown);
   const htmlTree = unified().use(remarkRehype).runSync(mdTree);
   const text = hastTreeToString(htmlTree);