[w3ctag/design-reviews] Anonymous iframes (#639)

Ya ya yawm TAG!

I'm requesting a TAG review of Anonymous iframes.

Anonymous iframes allows to load document that haven't enabled COEP in COEP environments. To make this safe, anonymous iframes restrict usage of shared storage and credentials, to avoid personalized resources being loaded in a high-risk crossOriginIsolated environment.

  - Explainer¹ (minimally containing user needs and example code): [https://github.com/camillelamy/explainers/blob/master/anonymous_iframes.md]
  - Security and Privacy self-review²: [https://github.com/camillelamy/explainers/blob/master/anonymous_iframes.md] (in the explainer)
  - GitHub repo (if you prefer feedback filed there): [https://github.com/camillelamy/explainers]
  - Primary contacts (and their relationship to the specification):
      - [Camille Lamy] ([camillelamy]), [Google]
  - Organization/project driving the design: [Chromium, Google]
  - External status/issue trackers for this feature (publicly visible, e.g. Chrome Status):
      - [Chrome Status](https://chromestatus.com/features/5729461725036544)

Further details:

  - [x] I have reviewed the TAG's [Web Platform Design Principles](https://w3ctag.github.io/design-principles/)

  - The group where the incubation/design work on this is being done (or is intended to be done in the future): WHATWG
  - The group where standardization of this work is intended to be done ("unknown" if not known): WHATWG
  - Existing major pieces of multi-stakeholder review or discussion of this design:
  - Major unresolved issues with or opposition to this design:
  - This work is being funded by: Google

You should also know that...

[please tell us anything you think is relevant to this review]

We'd prefer the TAG provide feedback as (please delete all but the desired option):

  🐛 open issues in our GitHub repo for **each point of feedback**

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