[Webkit-unassigned] [Bug 271623] New: isConditionalMediationAvailable and isUserVerifyingPlatformAuthenticatorAvailable incorrectly returns false on Safari on macOS

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=271623

            Bug ID: 271623
           Summary: isConditionalMediationAvailable and
                    isUserVerifyingPlatformAuthenticatorAvailable
                    incorrectly returns false on Safari on macOS
           Product: WebKit
           Version: Safari 17
          Hardware: Mac (Apple Silicon)
                OS: macOS 14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: james at manger.com.au

PublicKeyCredential.isConditionalMediationAvailable() returns false (after the promise resolves) on Safari 17.4 on macOS 14.4 when it should return true.

PublicKeyCredential.getClientCapabilities() returns conditionalMediation: true. So passkey (aka WebAuthn) conditional mediation is supported, but the two ways to report that are inconsistent.

var icma = await window.PublicKeyCredential.isConditionalMediationAvailable();
console.log(icma);

PublicKeyCredential.isUserVerifyingPlatformAuthenticatorAvailable() also returns false incorrectly.
PublicKeyCredential.getClientCapabilities() correctly returns userVerifyingPlatformAuthenticator: true.

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