Re: [webauthn] Add "Credential Manager Trust Group (CMTG) Key" extension (#2377)

> @timcappalli did we forget to add a client capability for this extension?

No. Extensions don't have explicit entries in the spec.

> The set of [keys](https://infra.spec.whatwg.org/#map-getting-the-keys) SHOULD also contain a key for each [extension](https://www.w3.org/TR/webauthn-3/#sctn-extensions) implemented by the client, where the key is formed by prefixing the string extension: to the [extension identifier](https://www.w3.org/TR/webauthn-3/#extension-identifier). The associated value for each implemented extension SHOULD be true.

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Received on Monday, 11 May 2026 18:45:51 UTC