[w3ctag/design-reviews] FedCM Auto Re-authentication API (Issue #813)

Wotcher TAG!

I'm requesting a TAG review of FedCM Auto Re-authentication API .

An extension to the existing [FedCM API](https://fedidcg.github.io/FedCM/) that provides a streamlined UX when users return to websites. The API requires that the user has already granted permission for the RelyingParty (RP) and Identity Provider (IdP) communication in the browser through a previous FedCM call.

  - Explainer¹ (minimally containing user needs and example code): [[url](https://github.com/fedidcg/FedCM/blob/main/proposals/auto-re-authentication-api.md)]
  - Security and Privacy self-review²: [[url](https://github.com/fedidcg/FedCM/blob/main/proposals/auto-re-authentication-api.md#privacy-consideration)]
  - GitHub repo (if you prefer feedback filed there): [[url](https://github.com/fedidcg/FedCM)]
  - Primary contacts (and their relationship to the specification):
      - [Yi Gu] (@yi-gu), Google
      - [Sam Goto] (@samuelgoto), Google, spec editor
  - Organization/project driving the design: [Google Chrome / FedCM]
  - External status/issue trackers for this feature (publicly visible, e.g. Chrome Status):
     - [Chrome Status](https://chromestatus.com/feature/5108344837111808)

Further details:

  - [x] I have reviewed the TAG's [Web Platform Design Principles](https://www.w3.org/TR/design-principles/)
  - The group where the incubation/design work on this is being done (or is intended to be done in the future): FedID CG
  - The group where standardization of this work is intended to be done ("unknown" if not known): unknown
  - Existing major pieces of multi-stakeholder review or discussion of this design: N/A
  - Major unresolved issues with or opposition to this design: N/A
  - This work is being funded by: Google Chrome
  
You should also know that the initial FedCM TAG review is https://github.com/w3ctag/design-reviews/issues/718. We're requesting a review specifically on the addition: auto re-authentication.

We'd prefer the TAG provide feedback as (please delete all but the desired option):
  💬 leave review feedback as a **comment in this issue** and @-notify @yi-gu


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