Not knowing Blink's policies here, I'd like to point out that while the PR 
was merged, the WebAuthn WG charter that would lead to Level 3 has not yet 
been approved.

On Thursday, October 14, 2021 at 2:49:39 AM UTC-6 yoav...@chromium.org 
wrote:

> On Wed, Oct 13, 2021 at 6:17 PM 'zakaria ridouh' via blink-dev <
> blin...@chromium.org> wrote:
>
>> *Contact emails*
>>
>> rid...@google.com
>>
>>
>> *Explainer*
>>
>> Add the authenticator attachment (platform/cross-platform) used during 
>> both registration and authentication to the public key credential payload 
>> returned from the browser to the RP/relying party (website/application etc).
>>
>>
>> This feature enables the following flow: 
>>
>> If the proposed authenticator attachment field of the 
>> attestation/assertion is “cross-platform”, and isUVPAA (i.e a 
>> user-verifying platform authenticator is available, already available 
>> within Chrome) returns true, then sites should have the ability to offer to 
>> the user to register the current device's platform authenticator.
>>
>>
>> This provides a superior user experience, by removing the need for the 
>> user to authenticate using a cross platform authenticator, and instead use 
>> the built in authenticator.
>>
>>
>> -- Development Bug: 
>> https://bugs.chromium.org/p/chromium/issues/detail?id=1243721
>>
>
> Apologies, but it's not clear to me what this does. A higher-level 
> explainer may be helpful here.
>  
>
>>
>> *Specification*
>>
>> W3C Spec Change Merged.
>>
>> https://github.com/w3c/webauthn/pull/1668
>>
>>
>> *Summary*
>>
>> Add the authenticator attachment (platform/cross-platform) used during 
>> both registration and authentication to the public key credential payload 
>> returned from the browser to the relying party (website/application etc).
>>
>>
>> *Blink component*
>>
>> Blink>WebAuthentication 
>> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EWebAuthentication>
>>
>>
>> *TAG review*
>>
>> N/A
>>
>
> Why is a TAG review not applicable? 
>
> *TAG review status*
>>
>> N/A
>>
>>
>> *Risks*
>>
>> N/A
>>
>>
>> *Interoperability and Compatibility*
>>
>> Gecko: No signal
>>
>> WebKit: No signal
>>
>
> Could you ask for signals? https://bit.ly/blink-signals
> Otherwise, we can't assess the interoperability risk of this change. (i.e. 
> whether other browser engines are likely to follow)
>  
>
>> Web developers: No signals
>>
>  
> Are developers likely to adopt this? If not, why are we adding this?
> https://goo.gle/developer-signals
>
>
>> Edge: Support Signals
>>
> Any links?
>  
>
>>
>> *Debuggability:*
>>
>> Use WebAuthn tab on Chrome Dev Tools, and based on which transport is 
>> picked, the authenticator attachment value on Public Key Credential 
>> following successful registration or authentication will be different 
>> (platform vs cross-platform).
>>
>>
>> *Is this feature fully tested by **web-platform-tests* 
>> <https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_platform_tests.md>
>> *?*
>>
>> Yes. Link to WPT CL: 
>> https://chromium-review.googlesource.com/c/chromium/src/+/3198901
>>
>>
>> *Flag name*
>>
>> #enable-web-authentication-authenticator-attachment
>>
>>
>> *Requires code in //chrome?*
>>
>> False
>>
>>
>> *Tracking bug*
>>
>> https://bugs.chromium.org/p/chromium/issues/detail?id=1243721
>>
>>
>> *Launch bug*
>>
>> N/A
>>
>>
>> *Estimated milestones*
>>
>> No milestones specified
>>
>>
>> *Link to entry on the Chrome Platform Status*
>>
>> https://chromestatus.com/feature/5698986645127168
>>
>>
>> This intent message was generated by Chrome Platform Status 
>> <https://www.chromestatus.com/>.
>>
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>>  
>> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CACR%2Ba_t2QFLf14CKJkG0JfefghZJ2D-ysNBf8BkTGUc%2BX_KU9A%40mail.gmail.com?utm_medium=email&utm_source=footer>
>> .
>>
>
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