Deprecate Google Privacy Sandbox (Browsing) Topics API #28418
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Google Chrome deprecated (Browsing) Topics API, so mark the following MDN features deprecated: - document.browsingTopics() - browsingtopics attribute on HTML <iframe> - browsingTopics option in fetch() - Sec-Browsing-Topics HTTP request header - Observe-Browsing-Topics HTTP response header - HTTP header Permissions-Policy directive browsing-topics Source: https://groups.google.com/a/chromium.org/g/blink-dev/c/_R85yctz4Rs
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caugner
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Nov 12, 2025
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Note that there are a handful of linter errors that should be fixable by running npm run fix.
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Thanks for making a start on this work, @bershanskiy.
You've caught most of the instances for the Topics API. You also need to deprecate:
- api.HTMLIFrameElement.browsingTopics
- api.Request.Request.init_browsingTopics_parameter
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Summary
Google Chrome deprecated (Browsing) Topics API.
Test results and supporting details
Google Chrome deprecated (Browsing) Topics API, so mark the following MDN features deprecated:
Source:
https://groups.google.com/a/chromium.org/g/blink-dev/c/_R85yctz4Rs
Related issues
Tracking MDN issue #28417.