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*Contact emails*
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miketa...@chromium.org
Explainer
See Motivation below.
Specification
https://wicg.github.io/ua-client-hints/#ch-ua-high-entropy-values
<https://wicg.github.io/ua-client-hints/#ch-ua-high-entropy-values>
Summary
Adds support for a 'ch-ua-high-entropy-values' permissions policy that
enables a top-level site to restrict which documents are able to collect
high-entropy client hints via the
navigator.userAgentData.getHighEntropyValues() JS API.
Blink component
Blink > Network > ClientHints
<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%20%3E%20Network%20%3E%20ClientHints%22>
Motivation
Currently it's only possible to restrict third-party collection of
high-entropy User-Agent Client Hints when they're requested over HTTP
(via the various permissions policies associated with each Client Hint,
i.e.,https://wicg.github.io/client-hints-infrastructure/#policy-controlled-features
<https://wicg.github.io/client-hints-infrastructure/#policy-controlled-features>).
The permissions policy proposed by this change allows a first-party site
to have more control over which third parties are allowed to request
high-entropy client hints via the getHighEntropyValues() JS API, which
could be deployed alongside the other permissions policies.
Initial public proposal
https://github.com/WICG/ua-client-hints/issues/151#issuecomment-783668130
<https://github.com/WICG/ua-client-hints/issues/151#issuecomment-783668130>
Interoperability and Compatibility
Gecko: Neutral. :mt had previously commented
<https://github.com/mozilla/standards-positions/issues/533#issuecomment-850030856>that
new UA-CH features should defer to their official position.
WebKit: Not requested yet. But the initial issue
<https://github.com/WICG/ua-client-hints/issues/151>that prompted this
feature was filed as feedback from WebKit.
Web developers: Informal support from a conversation with a developer
working on a privacy-focused search engine who was interested in this
feature.
WebView application risks
Nothing special here
Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?
Yes, WPTs will be added
Flag name on about://flags
None
Finch feature name
ClientHintUAHighEntropyValuesPermissionPolicy
Requires code in //chrome?
False
Tracking bug
https://issues.chromium.org/issues/385161047
<https://issues.chromium.org/issues/385161047>
Launch bug
https://launch.corp.google.com/launch/4366844
<https://launch.corp.google.com/launch/4366844>
Estimated milestones
No milestones specified
Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/6176703867781120?gate=4953839037579264
<https://chromestatus.com/feature/6176703867781120?gate=4953839037579264>
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