This is the W3C attestation mode checker. It's a work-in-progress. Other checkers available:

  1. RPID is Origin w/ Firefox attestation mode (Firefox 55)
  2. RPID is Domain String w/ Firefox attestation mode (Historical anomaly)
  3. WD-05 Mode (Firefox 56)
  4. Firefox 58 Mode

You can open this page inside an iframe for testing as well, or open a cross-origin iframe (which is prohibited and will give an error).

You can also load this page on port 8443 to test that alternate ports work for a given RP ID.

To use this to test Web Authentication support in Firefox, do the following:

  1. Open the Firefox advanced preferences in about:config.
  2. Search for "webauth"
  3. Enable (value=True) this:
    • security.webauth.webauthn
  4. Reload this page and click buttons!




Relying Party ID to use. "" and "" should be the only valid options.

Attestation type.