Technical review: Add WebAuthn Signal API

[chrisdavidmills]

Description

Chrome 132 supports the WebAuthn Signal API. Specifically, this means support for the following static methods:

• PublicKeyCredential.signalAllAcceptedCredentials()
• PublicKeyCredential.signalCurrentUserDetails()
• PublicKeyCredential.signalUnknownCredential()

This PR adds reference pages for all of the above methods. It also attempts to consolidate all the information on MDN about discoverable credentials into a single section on the WebAuthn home page. I noticed that quite a few details were dotted around on various pages, and wanted to link all of the reference pages I added to a single place for more information, rather than having to explain discoverable credentials on each page.

Please let me know if this writeup of discoverable credentials sounds correct.

Motivation

Additional details

• See the relevant ChromeStatus entry
• Keep passkeys consistent with credentials on your server with the Signal API

Related issues and pull requests

• BCD is already available for these methods.

[github-actions]

Preview URLs (9 pages)

• /en-US/docs/Web/API/CredentialsContainer/get
• /en-US/docs/Web/API/PublicKeyCredential/isConditionalMediationAvailable_static
• /en-US/docs/Web/API/PublicKeyCredential/signalAllAcceptedCredentials_static
• /en-US/docs/Web/API/PublicKeyCredential/signalCurrentUserDetails_static
• /en-US/docs/Web/API/PublicKeyCredential/signalUnknownCredential_static
• /en-US/docs/Web/API/PublicKeyCredentialCreationOptions
• /en-US/docs/Web/API/PublicKeyCredentialRequestOptions
• /en-US/docs/Web/API/PublicKeyCredential
• /en-US/docs/Web/API/Web_Authentication_API

Flaws (1)

Note! 8 documents with no flaws that don't need to be listed. 🎉

URL: /en-US/docs/Web/API/Web_Authentication_API
Title: Web Authentication API
Flaw count: 1

• macros:
  • /en-US/docs/Web/API/PublicKeyCredential/isConditionalMediationAvailable redirects to /en-US/docs/Web/API/PublicKeyCredential/isConditionalMediationAvailable_static

External URLs (17)

URL: /en-US/docs/Web/API/Web_Authentication_API
Title: Web Authentication API

• https://passkeys.dev/ (1 time) (Note! This may be a new URL 👀)
• https://web.dev/articles/passkey-form-autofill (1 time) (Note! This may be a new URL 👀)
• https://web.dev/articles/passkey-registration (1 time) (Note! This may be a new URL 👀)
• https://web.dev/articles/webauthn-discoverable-credentials (1 time) (Note! This may be a new URL 👀)

---

URL: /en-US/docs/Web/API/PublicKeyCredential
Title: PublicKeyCredential

• https://en.wikipedia.org/wiki/Relying_party (2 times) (Note! This may be a new URL 👀)

---

URL: /en-US/docs/Web/API/PublicKeyCredential/signalUnknownCredential_static
Title: PublicKeyCredential: signalUnknownCredential() static method

• https://developer.chrome.com/docs/identity/webauthn-signal-api (1 time) (Note! This may be a new URL 👀)
• https://en.wikipedia.org/wiki/Relying_party (1 time) (Note! This may be a new URL 👀)
• https://passkeys.dev/ (1 time) (Note! This may be a new URL 👀)

---

URL: /en-US/docs/Web/API/PublicKeyCredential/signalAllAcceptedCredentials_static
Title: PublicKeyCredential: signalAllAcceptedCredentials() static method

• https://developer.chrome.com/docs/identity/webauthn-signal-api (1 time) (Note! This may be a new URL 👀)
• https://en.wikipedia.org/wiki/Relying_party (1 time) (Note! This may be a new URL 👀)
• https://glitch.com/edit/ (1 time) (Note! This may be a new URL 👀)
• https://passkeys.dev/ (1 time) (Note! This may be a new URL 👀)
• https://signal-api-demo.glitch.me/ (1 time) (Note! This may be a new URL 👀)

---

URL: /en-US/docs/Web/API/PublicKeyCredential/signalCurrentUserDetails_static
Title: PublicKeyCredential: signalCurrentUserDetails() static method

• https://developer.chrome.com/docs/identity/webauthn-signal-api (1 time) (Note! This may be a new URL 👀)
• https://glitch.com/edit/ (1 time) (Note! This may be a new URL 👀)
• https://passkeys.dev/ (1 time) (Note! This may be a new URL 👀)
• https://signal-api-demo.glitch.me/ (1 time) (Note! This may be a new URL 👀)