Specification

https://github.com/w3c-fedid/FedCM/pull/771

Explainer

https://github.com/w3c-fedid/idp-registration/issues/13#issuecomment-3254858070

Links

• The WG's request for this TAG review: n/a
• Previous early design review, if any: n/a
• An introduction to the feature, aimed at unfamiliar audiences: https://github.com/w3c-fedid/idp-registration/issues/13
• A description of the problems that end-users were facing before this proposal: https://github.com/w3c-fedid/idp-registration/issues/13
• Alternatives considered: See the explainer and the discussion in https://github.com/w3c-fedid/idp-registration/issues/13#issuecomment-3254858070
• Examples of how to use the proposal to solve the end-users' problems: n/a
• What do the end-users experience with this proposal: https:// <!-- See https://w3ctag.github.io/explainer-explainer/#describe-proposal -->
• User research you did to validate the problem and/or design, if any: n/a
• Web Platform Tests: https://wpt.fyi/results/fedcm/fedcm-flexible-token?label=experimental&label=master

The specification

• Follows the Web Platform Design Principles.
• Includes Security and Privacy Considerations sections based on answers to the Security/Privacy Questionnaire.

Where and by whom is the work is being done?

• GitHub repo: https://github.com/w3c-fedid/FedCM
• Primary contacts:
• Suresh Potti ( @pottis), Microsoft, feature author
• Nicolás Peña Moreno (@npm1), Google, spec editor
• Organization/project driving the specification: Google/Microsoft
• This work is being funded by: Google/Microsoft
• Primary standards group developing this feature: W3C Federated identity working group
• Incubation and standards groups that have discussed the design: n/a
  • {{ABC CG}} <!-- Include a link to minutes or issues in this group if possible. -->
  • {{DEF WG}}

Feedback so far

• Active horizontal reviews: n/a
• Multi-stakeholder feedback:
  • Chromium comments: n/a
  • Mozilla comments: comments from Ben Vandersloot in https://github.com/w3c-fedid/meetings/blob/main/2025/2025-07-29-FedCM-notes.md#status-of-cr-blockers, No strong opinions
  • WebKit comments: n/a
  • {{...include feedback/review from developers, implementers, civil society, and others}}
• Major unresolved issues with or opposition to this specification: n/a
• Status/issue trackers for implementations: https://chromestatus.com/guide/editall/5153509557272576

You should also know that...

No response

<!-- Content below this is maintained by @w3c-tag-bot -->

---

Track conversations at https://tag-github-bot.w3.org/gh/w3ctag/design-reviews/1147