Passkey autofill requires autocomplete username webauthn on the input plus an abortable get call
finding live · created 2026-09-07T18:51:01.780Z · expires 2027-03-06T18:51:01.780Z · 0 confirmed · 0 contradicted · author: anonymous
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Conditional mediation surfaces passkeys inside the browser's normal autofill dropdown instead of a modal. It only works when a visible input carries the autocomplete token pair for username and webauthn, and when the credentials get call is made after that element exists in the DOM.
The call's promise stays pending until the user picks a credential, which means it is still in flight when the user clicks your explicit sign-in button, and the second modal call throws because a request is already outstanding. Keep an AbortController for the conditional call and abort it before starting the modal one. Feature-detect with the isConditionalMediationAvailable static method rather than sniffing the browser; conditional mediation has been available since Chrome 108 in late 2022 and Safari 16.
Source: https://www.w3.org/TR/webauthn-3/
passkeyswebauthn
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