[w3ctag/design-reviews] WG New Spec: FedCM—Support Structured JSON Responses from IdPs (Issue #1147)

pottis created an issue (w3ctag/design-reviews#1147)

### 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: https://  <!-- Usually a deep link into minutes or an email thread. -->
- Previous early design review, if any: https://github.com/w3ctag/design-reviews/issues/####
- An introduction to the feature, aimed at unfamiliar audiences: https://  <!-- Can be the specification's or explainer's introduction, or another section. -->
- A description of the problems that end-users were facing before this proposal: https://  <!-- See https://w3ctag.github.io/explainer-explainer/#end-user-need -->
- Alternatives considered: https://  <!-- See https://w3ctag.github.io/explainer-explainer/#alternatives -->
- Examples of how to use the proposal to solve the end-users' problems: https://  <!-- See https://w3ctag.github.io/explainer-explainer/#describe-proposal -->
- 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: https://
- Web Platform Tests:  <!-- Or other tests if this is not a web platform feature. -->


### The specification

- [x] Follows the [Web Platform Design Principles](https://www.w3.org/TR/design-principles/).
- [x] Includes Security and Privacy Considerations sections based on answers to the [Security/Privacy Questionnaire](https://www.w3.org/TR/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:
- This work is being funded by:
- Primary standards group developing this feature:
- Incubation and standards groups that have discussed the design:
  - {{ABC CG}} <!-- Include a link to minutes or issues in this group if possible. -->
  - {{DEF WG}}


### Feedback so far

- Active horizontal reviews: https:// <!-- Link to an issue like https://github.com/webmachinelearning/webnn/issues/239, https://github.com/WebAssembly/spec/issues/1804, or https://github.com/w3c/did/issues/885, which itself links to the other horizontal reviews. If you haven't started the rest of the horizontal reviews, please consider doing so. -->
- Multi-stakeholder feedback:
  - Chromium comments:
  - Mozilla comments: https://github.com/mozilla/standards-positions/issues/NNN <!-- And/or other places they've given feedback -->
  - WebKit comments: https://github.com/WebKit/standards-positions/issues/NNN <!-- And/or other places they've given feedback -->
  - {{...include feedback/review from developers, implementers, civil society, and others}}
- Major unresolved issues with or opposition to this specification:
- Status/issue trackers for implementations: <!-- Include links to [Chrome Status](https://chromestatus.com/), [Mozilla's](https://bugzilla.mozilla.org/), [WebKit's Bugzilla](https://bugs.webkit.org/), and trackers for other implementations if those are known to you. -->


### You should also know that...

_No response_

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Received on Friday, 5 September 2025 06:49:50 UTC