[w3ctag/design-reviews] FYI - Web Authentication API: PublicKeyCredential’s getClientCapabilities() method (Issue #1016)

こんにちは TAG-さん!

Per the Chromium Intent to Ship, [it was advised that I file a TAG review as a FYI, because this is related to feature detection](https://groups.google.com/a/chromium.org/g/blink-dev/c/-u_7GCYU0sY) - hence this request.

I'm requesting a TAG review of Web Authentication API: PublicKeyCredential’s getClientCapabilities() method.

`getClientCapabilities()` method allows to determine which WebAuthn features are supported by the user's client. The method returns a list of supported capabilities, allowing developers to tailor authentication experiences and workflows based on the client's specific functionality. Context: https://github.com/w3c/webauthn/pull/1923

  - Explainer¹: none
  - Specification: https://w3c.github.io/webauthn/#sctn-getClientCapabilities
  - WPT Tests: https://wpt.fyi/results/webauthn/getclientcapabilities.https.html
  - User research: none
  - Security and Privacy self-review²: 
  - GitHub repo: https://github.com/w3c/webauthn/
  - Primary contacts:
      - Andrii Natiahlyi (@natiahlyi), Google, implementing the feature in Chromium
  - Organization/project driving the specification: the WebAuthn Working Group
  - Multi-stakeholder support³:
    - Chromium comments: yes
    - Mozilla comments: https://github.com/mozilla/standards-positions/issues/1114
    - WebKit comments: [Added support for getClientCapabilities(). (119058559)](https://developer.apple.com/documentation/safari-release-notes/safari-17_4-release-notes#WebAuthn)
  - Status/issue trackers for implementations⁴: https://chromestatus.com/feature/5141695044255744?gate=5532327385497600
  
Further details:
  - [x] I have reviewed the TAG's [Web Platform Design Principles](https://www.w3.org/TR/design-principles/)
  - Relevant time constraints or deadlines: 
  - The group where the work on this specification is currently being done:  WebAuthn WG
  - Major unresolved issues with or opposition to this specification: None
  - This work is being funded by: Google


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