PSA: Re-adding Credential.isConditionalMediationAvailable() to the Credential interface
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Mohamed Amir Yosef
Mar 16, 2026, 4:13:02 AM (5 days ago)
Mar 16
to blink-dev
Hi everyone,
This is a quick PSA to let you know that we are restoring the isConditionalMediationAvailable() static method to the base Credential interface.
Background:
Credential.isConditionalMediationAvailable() was originally approved in this Intent to Ship [1]. However, when conditional mediation was shipped for PublicKeyCredential [2],
the method was accidentally removed from the base Credential interface in this CL [3].
This removal caused failures in some Web Platform Tests (WPTs) that expect the method to be present on the base Credential interface, as dictated by the
Credential Management spec [4].
What is changing:
To fix these test failures and align with the specification, we are landing a fix (CL 7663697) [5] that:
1. Re-adds isConditionalM ediationAvailable() to the base Credential IDL.
2. Implements a default behavior in Credential that returns false.
3. Maintains the specialized implementation in PublicKeyCredential that queries the authenticator for WebAuthn-specific support.
Since this is simply restoring a previously approved API that disappeared by mistake, no new API approvals or Intent to Ship are required. This email serves as a record for the
history books.
Please let me know if you have any questions!
Thanks,
Mohamed
Links:
[1] Original Approval: https://groups.google.com/a/chromium.org/g/blink-dev/c/7ouLjWzcjb0/m/gdHNpAhgBwAJ
[2] PublicKeyCredential I2S: https://groups.google.com/a/chromium.org/g/blink-dev/c/gB4yAmF4msE/m/NfaPLNkcAgAJ
[3] CL where it accidentally disappeared: https://crrev.com/c/3792649
[4] Credential Management Spec: https://www.w3.org/TR/credential-management-1/#the-credential-interface
[5] Current Fix CL: https://crrev.com/c/7663697
This is a quick PSA to let you know that we are restoring the isConditionalMediationAvailable() static method to the base Credential interface.
Background:
Credential.isConditionalMediationAvailable() was originally approved in this Intent to Ship [1]. However, when conditional mediation was shipped for PublicKeyCredential [2],
the method was accidentally removed from the base Credential interface in this CL [3].
This removal caused failures in some Web Platform Tests (WPTs) that expect the method to be present on the base Credential interface, as dictated by the
Credential Management spec [4].
What is changing:
To fix these test failures and align with the specification, we are landing a fix (CL 7663697) [5] that:
1. Re-adds isConditionalM ediationAvailable() to the base Credential IDL.
2. Implements a default behavior in Credential that returns false.
3. Maintains the specialized implementation in PublicKeyCredential that queries the authenticator for WebAuthn-specific support.
Since this is simply restoring a previously approved API that disappeared by mistake, no new API approvals or Intent to Ship are required. This email serves as a record for the
history books.
Please let me know if you have any questions!
Thanks,
Mohamed
Links:
[1] Original Approval: https://groups.google.com/a/chromium.org/g/blink-dev/c/7ouLjWzcjb0/m/gdHNpAhgBwAJ
[2] PublicKeyCredential I2S: https://groups.google.com/a/chromium.org/g/blink-dev/c/gB4yAmF4msE/m/NfaPLNkcAgAJ
[3] CL where it accidentally disappeared: https://crrev.com/c/3792649
[4] Credential Management Spec: https://www.w3.org/TR/credential-management-1/#the-credential-interface
[5] Current Fix CL: https://crrev.com/c/7663697
Mike Taylor
Mar 16, 2026, 8:26:06 AM (5 days ago)
Mar 16
to Mohamed Amir Yosef, blink-dev
Thanks Mohamed!
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