[w3ctag/design-reviews] COOP: restrict-properties early review (Issue #760)

Wotcher TAG!

I'm requesting a TAG review of a new value for Cross-Origin-Opener-Policy: "restrict-properties".

This is the [second iteration](https://github.com/w3ctag/design-reviews/issues/649) of trying to have crossOriginIsolated while interacting with cross-origin popups. The goal is still the same: be able to benefit from powerful APIs like SharedArrayBuffer without breaking interaction with cross-origin popups like Auth flows or payments.

  - Explainer¹ (minimally containing user needs and example code): [[url](https://github.com/hemeryar/explainers/blob/main/coop_restrict_properties.md)]
  - Security and Privacy self-review²: [[url](https://github.com/hemeryar/explainers/blob/main/coop_rp_tag_questionnaire.md)]
  - Primary contacts (and their relationship to the specification):
      - [Arthur Hemery] ([[github username](https://github.com/hemeryar)]), [Google]
      - [Camille Lamy] ([[github username](https://github.com/camillelamy)]), [Google]
  - Organization/project driving the design: [Google]
  - External status/issue trackers for this feature (publicly visible, e.g. Chrome Status): https://chromestatus.com/feature/5072630953017344


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): 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: https://github.com/whatwg/html/issues/6364

  - Major unresolved issues with or opposition to this design: We'll be running an origin trial on Chrome to verify that there are no deployment blockers for web developers. The spec agreement should follow once we've demonstrated (or not) that this solution works.
  - 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 :
  💬 leave review feedback as a **comment in this issue** and @-notify [hemeryar]


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