*Contact emails*
[email protected]
*Explainer*
https://github.com/WICG/ua-client-hints/blob/main/README.md (probably
more useful to look at the Summary & Motivation)
*Specification*
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. Restricting
collection of high-entropy hints over HTTP is already possible via
existing per-client-hint permissions policies.
*Blink component*
Blink > Network > ClientHints
<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%20%3E%20Network%20%3E%20ClientHints%22>
*Web Feature ID*
ua-client-hints <https://webstatus.dev/features/ua-client-hints>
*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).
The permissions policy introduced in 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
*TAG review*
N/A: UA-CH has already been reviewed by TAG, and this is a small,
incremental addition to the API.
*TAG review status*
Not applicable
*Risks*
*Interoperability and Compatibility*
/No information provided/
/Gecko/:
Neutral (https://mozilla.github.io/standards-positions/#ua-client-hints) I
haven't requested a new position for this small addition, since they
don't support any of it, but they are neutral on the API itself.
/WebKit/: No
signal (https://github.com/WebKit/standards-positions/issues/70#issuecomment-3488097085) No
official position, as it's blocked on a position on Client Hints in
general. But I have left a comment with a pointer to this feature.
/Web developers/: No signals
/Other signals/:
*WebView application risks*
Does this intent deprecate or change behavior of existing APIs, such
that it has potentially high risk for Android WebView-based applications?
N/A
*Debuggability*
/No information provided/
*Will this feature be supported on all six Blink platforms (Windows,
Mac, Linux, ChromeOS, Android, and Android WebView)?*
No
*Is this feature fully tested byweb-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?*
Yes
https://wpt.fyi/results/client-hints/permissions-policy?label=experimental&label=master&aligned
<https://wpt.fyi/results/client-hints/permissions-policy?label=experimental&label=master&aligned>
*Flag name on about://flags*
/No information provided/
*Finch feature name*
ClientHintUAHighEntropyValuesPermissionPolicy
*Rollout plan*
Will ship enabled for all users
*Requires code in //chrome?*
False
*Tracking bug*
https://issues.chromium.org/issues/385161047
*Launch bug*
https://launch.corp.google.com/launch/4366844
*Estimated milestones*
Shipping on desktop 144
Shipping on Android 144
Shipping on WebView 144
*Anticipated spec changes*
Open questions about a feature may be a source of future web compat or
interop issues. Please list open issues (e.g. links to known github
issues in the project for the feature specification) whose resolution
may introduce web compat/interop risk (e.g., changing to naming or
structure of the API in a non-backward-compatible way).
None
*Link to entry on the Chrome Platform Status*
https://chromestatus.com/feature/6176703867781120?gate=5312509740056576
*Links to previous Intent discussions*
Intent to
Prototype:https://groups.google.com/a/chromium.org/d/msgid/blink-dev/d302cc34-870b-4978-a583-4918ee1631c0%40chromium.org
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