[w3ctag/spec-reviews] allow-top-navigation-by-user-activation (#154)

Hello TAG!

I'm requesting a TAG review of:

  - Name: The new "allow-top-navigation-by-user-activation" `<iframe sandbox>` flag
  - Specification URL: https://github.com/whatwg/html/pull/2292
  - Explainer, Requirements Doc, or Example code: see https://github.com/WICG/interventions/issues/42 for some background, and note how the proposal morphed from initially changing the behavior of allow-top-navigation to introducing a new keyword, allow-top-navigation-by-user-activation
  - Primary contacts: @domenic, @lubin2010

Further details (optional):

  - Relevant time constraints or deadlines: Chrome is hoping to ship this in a branch that will branch March 2, so any feedback before then would be helpful.
  - [x] I have read and filled out the [Self-Review Questionnare on Security and Privacy](https://www.w3.org/TR/security-privacy-questionnaire/). Although this touches on related areas, it's largely a strengthening of the isolation that was present before (with allow-top-navigation), and none of the questions seem directly relevant.
  - [x] I have reviewed the TAG's [API Design Principles](https://w3ctag.github.io/design-principles/)

We'd prefer the TAG provide feedback as (please select one):

  - [ ] open issues in our Github repo for each point of feedback
  - [x] open a single issue in our Github repo for the entire review (preferably comment on https://github.com/whatwg/html/pull/2292)
  - [ ] leave review feedback as a comment in this issue and @-notify [github usernames]


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