Deprecate attribution-reporting

Author: ddbeck

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: Due to declining interest from web developers and lack of interest from other browser vendors, Google decided to withdraw many Privacy Sandbox features including the attribution reporting API.
+  according_to:
+    - https://privacysandbox.com/news/update-on-plans-for-privacy-sandbox-technologies/
+    - https://chromestatus.com/feature/5194473869017088
 compat_features:
   - api.HTMLAnchorElement.attributionSrc
   - api.HTMLAreaElement.attributionSrc

features/topics.yml

@@ -1,5 +1,5 @@
 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/
 compat_features:
   - api.Document.browsingTopics