FedCM: Alternative Fields in Account Selection

Category: Miscellaneous
Type: New or changed feature
Status: Proposed (Chrome Proposed)
Intent stage: None

Summary

Adds support for phone numbers and usernames, in addition to or instead of a user's full name and email address as identifiers for disambiguating accounts in the account selector. Also, makes these new fields available for websites to affect the disclosure text.

Motivation

Some identity providers do not use email addresses and full names to identify users. This makes it easier for such IdPs to adopt FedCM.

Standards & signals

Specification: https://github.com/w3c-fedid/FedCM/pull/718
Firefox: No signal — For incremental improvements to FedCM, Firefox has asked us not to file standards position, and they will instead provide feedback in the GitHub PR. The Firefox lead engineer on FedCM has expressed support in https://github.com/w3c-fedid/FedCM/issues/435#issuecomment-2776163171
Safari: No signal — Safari has closed other position requests for FedCM subfeatures without position (e.g. https://github.com/WebKit/standards-positions/issues/120) in favor of giving a position on FedCM in general. That issue is still open.
Web developers: Positive
Tracking bug: https://crbug.com/382086282

Explainers: https://github.com/w3c-fedid/FedCM/issues/435#issuecomment-2718856194

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