Hi,
Could you also review and ship this in blink-dev? Thanks!

Bests,
Victor

On Monday, November 22, 2021 at 11:39:47 AM UTC-5 Victor Tan wrote:

> Contact emails
>
> victor...@chromium.org, miketa...@chromium.org, jadekess...@chromium.org
>
>
> Specification
>
> https://wicg.github.io/ua-client-hints/#sec-ch-ua-full-version-list
>
>
> Summary
>
> The Sec-CH-UA-Full-Version-List request header field gives a server 
> information about the full version for each brand in its brands list.
>
>
> Blink component
>
> Privacy>Fingerprinting 
> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Privacy%3EFingerprinting>
>
>
> Motivation
>
> As raised in UA-CH Issue 196 
> <https://github.com/WICG/ua-client-hints/issues/196>, 
> Sec-CH-UA-Full-Version can be considered too tightly bound to the  primary 
> brand in the brand list 
> <https://wicg.github.io/ua-client-hints/#user-agent-brands>, especially 
> for embedders. In order to prevent classes of bugs where a site might think 
> the fictional “Hamburger” browser is not up to date (because its version 
> scheme is different, and lower than Chromium’s), we propose to expose the 
> full version of each brand in the brand list, by requesting this new client 
> hint.
>
> Here’s what that would look like:
>
> Sec-CH-UA-Full-Version-List: “Hamburger”; v="92.0.902.73", "Chromium"; 
> v="92.0.4515.131", "?Not:A Browser"; v="3.1.2.0"
>
> Eventually, it will make sense to deprecate and remove 
> Sec-CH-UA-Full-Version 
> <https://wicg.github.io/ua-client-hints/#sec-ch-ua-full-version> 
> (assuming usage allows us to do so). But we do not intend to do that until 
> we ship its replacement.
>
>
> Initial public proposalhttps://github.com/WICG/ua-client-hints/issues/196
>
> TAG review
>
> https://github.com/w3ctag/design-reviews/issues/640
>
>
> TAG review status
>
> Pending (there’s a pre-existing review, and this hint came up in the 
> review process as feedback from other browsers, so the TAG is aware of it).
>
>
> RisksInteroperability and CompatibilityThis is a new hint, so it should 
> not create compatibility issues.
>
>   Edge: This hint was added to solve a bug (maybe a feature request?) 
> <https://github.com/WICG/ua-client-hints/issues/196> by Edge folks.
>
> Gecko: Non-harmful (
> https://mozilla.github.io/standards-positions/#ua-client-hints)
>
> WebKit: Requested through email 
> <https://lists.webkit.org/pipermail/webkit-dev/2021-November/032047.html>
>
> Web developers: No signals
> Debuggability
>
> No special DevTools support needed. It should just work™.
>
>
> Is this feature fully tested by web-platform-tests 
> <https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_platform_tests.md>
> ?
>
> Yes. https://chromium-review.googlesource.com/c/chromium/src/+/3256910 
>
>
> Flag name
>
> UserAgentClientHintFullVersionList
>
> Requires code in //chrome?
>
> False
>
>
> Tracking bug
>
> https://bugs.chromium.org/p/chromium/issues/detail?id=1249246
>
>
> Launch bug
>
> https://bugs.chromium.org/p/chromium/issues/detail?id=1260418
>
>
> Link to entry on the Chrome Platform Status
>
> https://chromestatus.com/feature/5703317813460992
>
>

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