I've raised a potentially-breaking spec issue which I'd like to get a 
conclusion on before LGTMing 
this: https://github.com/WICG/ua-client-hints/issues/355

On Thursday, February 29, 2024 at 2:03:07 AM UTC+9 Yoav Weiss wrote:

> LGTM2
>
> On Wed, Feb 21, 2024 at 6:04 PM Vladimir Levin <vmp...@chromium.org> 
> wrote:
>
>>
>>
>> On Wed, Feb 21, 2024 at 11:25 AM Dustin Mitchell <djmit...@google.com> 
>> wrote:
>>
>>> Thanks for the comments!
>>>
>>> On Tue, Feb 20, 2024 at 11:10 AM Vladimir Levin <vmp...@chromium.org> 
>>> wrote:
>>>
>>>>
>>>>
>>>> On Tue, Feb 20, 2024 at 7:06 AM 'Dustin Mitchell' via blink-dev <
>>>> blink-dev@chromium.org> wrote:
>>>>
>>>>> Contact emailsdjmit...@chromium.org
>>>>>
>>>>> Explainer
>>>>> https://github.com/djmitche/web-explainers/blob/main/sec-ch-ua-form-factor.md
>>>>>
>>>>> Specification
>>>>> https://wicg.github.io/ua-client-hints/#sec-ch-ua-form-factor
>>>>>
>>>>> Design docs
>>>>>
>>>>> https://github.com/djmitche/web-explainers/blob/main/sec-ch-ua-form-factor.md
>>>>>
>>>>> Summary
>>>>>
>>>>> This hint indicates the "form-factor" of the user-agent / device, so 
>>>>> that the site can tailor its response.
>>>>>
>>>>>
>>>>> Blink componentBlink>Network 
>>>>> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3ENetwork>
>>>>>
>>>>> Search tagsua-ch <https://chromestatus.com/features#tags:ua-ch>, uach 
>>>>> <https://chromestatus.com/features#tags:uach>, form-factor 
>>>>> <https://chromestatus.com/features#tags:form-factor>
>>>>>
>>>>> TAG reviewThis feature simply adds a new hint to the existing set of 
>>>>> hints, containing data that was previously represented in the user-agent 
>>>>> string.
>>>>>
>>>>
>>>> Although this info may be available, I suspect this can be a new 
>>>> channel of information for clients that override the user-agent string or 
>>>> where this information isn't provided in the user-agent string. I don't 
>>>> believe this to be a problem, but just something to consider
>>>>
>>>
>>> That's a good point, and likely needs to be considered for all client 
>>> hints. Do you think it's worth adding an issue in 
>>> https://github.com/WICG/ua-client-hints to track this?
>>>
>>
>> I don't feel particularly strongly about this, but raising the issue to 
>> invite more opinions seems worthwhile. 
>>
>>
>>>  
>>>>
>>>>>
>>>>>
>>>>> TAG review statusNot applicable
>>>>>
>>>>> Risks
>>>>>
>>>>>
>>>>> Interoperability and Compatibility
>>>>>
>>>>> If other browsers do not implement this hint, then the information 
>>>>> will only be available in Chrome, and other browsers will implicitly 
>>>>> return 
>>>>> an empty value.
>>>>>
>>>>>
>>>>> *Gecko*: No signal
>>>>>
>>>>> *WebKit*: No signal
>>>>>
>>>>
>>>> Can you please file requests for positions for both Gecko and WebKit?
>>>>
>>>
>>> Gecko: https://mozilla.github.io/standards-positions/#ua-client-hints
>>> Webkit: 
>>> https://lists.webkit.org/pipermail/webkit-dev/2024-February/032618.html
>>>
>>
>> Thank you for doing this. For posterity in the future, for WebKit, it 
>> might be better to file an issue here: 
>> https://github.com/WebKit/standards-positions/issues
>>  
>>
>>>  
>>>
>>>>
>>>>
>>>>> *Web developers*: No signals
>>>>>
>>>>> *Other signals*:
>>>>>
>>>>> Ergonomics
>>>>>
>>>>> None - this fits with existing, similar client hints.
>>>>>
>>>>>
>>>>> Activation
>>>>>
>>>>> No activation risks - developers will always need to handle the 
>>>>> situation where this hint is unavailable.
>>>>>
>>>>>
>>>>> Security
>>>>>
>>>>> None
>>>>>
>>>>>
>>>>> 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?
>>>>>
>>>>> No change to existing behavior; this adds a new hint which sites must 
>>>>> opt in to. Killswitch is available: ClientHintsFormFactor
>>>>>
>>>>>
>>>>> Debuggability
>>>>>
>>>>> No changes in the checklist apply.
>>>>>
>>>>>
>>>>> Will this feature be supported on all six Blink platforms (Windows, 
>>>>> Mac, Linux, ChromeOS, Android, and Android WebView)?Yes
>>>>>
>>>>> Is this feature fully tested by web-platform-tests 
>>>>> <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
>>>>> ?Yes
>>>>>
>>>>> Included in existing tests for other client hints: 
>>>>> https://wpt.fyi/results/html/webappapis/system-state-and-capabilities/the-navigator-object/navigator_user_agent.https.html?label=experimental&label=master&aligned
>>>>>  
>>>>> https://wpt.fyi/results/workers/WorkerNavigator_userAgentData.https.html?label=experimental&label=master&aligned
>>>>>
>>>>>
>>>>> DevTrial instructions
>>>>> https://github.com/djmitche/web-explainers/blob/main/sec-ch-ua-form-factor-howto.md
>>>>>
>>>>> Flag name on chrome://flagsNone
>>>>>
>>>>> Finch feature nameClientHintsFormFactor
>>>>>
>>>>> Requires code in //chrome?True
>>>>>
>>>>> Tracking bug
>>>>> https://bugs.chromium.org/p/chromium/issues/detail?id=1442283
>>>>>
>>>>> Launch bughttps://launch.corp.google.com/launch/4258684
>>>>>
>>>>> MeasurementNone
>>>>>
>>>>> Availability expectationFeature is available only in Chromium 
>>>>> browsers for the foreseeable future.
>>>>>
>>>>> Adoption expectationFeature is used by specific partner(s) to provide 
>>>>> functionality within 12 months of launch in Chrome.
>>>>>
>>>>> Adoption planNew form-factors will add additional strings to this 
>>>>> hint, within the values given in the draft spec. The 
>>>>> ClientHintsXRFormFactor gates one such addition.
>>>>>
>>>>> Estimated milestones
>>>>> Shipping on desktop 123
>>>>> DevTrial on desktop 122
>>>>> Shipping on Android 123
>>>>> DevTrial on Android 122
>>>>> Shipping on WebView 123
>>>>>
>>>>> 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).
>>>>> No open issues
>>>>>
>>>>> Link to entry on the Chrome Platform Status
>>>>> https://chromestatus.com/feature/5162545698045952
>>>>>
>>>>> Links to previous Intent discussionsIntent to prototype: 
>>>>> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CALMtyTTPUMfjo2v9s%3DKMALpS5MUcicvpM2ycNtz6GbRZ9JOaXQ%40mail.gmail.com
>>>>>
>>>>> This intent message was generated by Chrome Platform Status 
>>>>> <https://chromestatus.com/>.
>>>>>
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>>>>>  
>>>>> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CALMtyTRPFmmHkrk24dSby%2B1bqTft%3DtUG-btxP_bg4Ckx4DNarw%40mail.gmail.com?utm_medium=email&utm_source=footer>
>>>>> .
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