FedCM: Alternative Fields in Account Selection

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

Breaking change: No
Enterprise impact: None
Chromium flag: FedCmAlternativeIdentifiers
Spec maturity: Working draft

WPT details: https://wpt.fyi/fedcm/alternative-identifiers Some of the UI-centric aspects of this feature can not be tested with web platform tests, but the WPT tests we added verify that phone numbers and usernames are supported as valid fields by the user agent.

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

Ecosystem

Web Platform Tests: https://wpt.fyi/results/?q=fedcm%2Falternative-identifiers
Chrome Platform Showcase: https://chrome-platform-showcase.paulkinlan-ea.deno.net/features
GenDN reference: https://gendn.paulkinlan-ea.deno.net/features
chrome.dev demos search: https://www.google.com/search?q=site%3Achrome.dev+FedCM%3A%20Alternative%20Fields%20in%20Account%20Selection
MDN Web Docs: https://developer.mozilla.org/en-US/search?q=FedCM%3A%20Alternative%20Fields%20in%20Account%20Selection
Baseline status: https://webstatus.dev/?q=FedCM%3A%20Alternative%20Fields%20in%20Account%20Selection

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

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