[w3ctag/design-reviews] TAG review request: User Activation Delegation through postMessages (#347)

こんにちはTAG！

I'm requesting a TAG review of:

  - Name: User Activation Delegation through postMessages
  - Specification URL: https://github.com/whatwg/html/pull/4369

  - Explainer: [mustaqahmed.github.io/user-activation-delegation](https://mustaqahmed.github.io/user-activation-delegation)
    Design doc: [link](https://docs.google.com/document/d/1NKLJ2MBa9lA_FKRgD2ZIO7vIftOJ_YiXXMYfRMdlV-s/edit?usp=sharing)
  - Tests: Work in progress in [html/user-activation/](https://github.com/web-platform-tests/wpt/tree/master/html/user-activation).
  - Primary contacts: @mustaqahmed

Further details (optional):

  - Relevant time constraints or deadlines: [please provide]
  - [X] I have read and filled out the [Self-Review Questionnare on Security and Privacy](https://www.w3.org/TR/security-privacy-questionnaire/).
    The [assessment is here](https://github.com/mustaqahmed/user-activation-delegation/blob/d649ad2349f68963a9679abeb6ef3dd1cb3b0dba/security_and_privacy_questionnaire.md).
  - [X] I have reviewed the TAG's [API Design Principles](https://w3ctag.github.io/design-principles/).

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 select one):

  - [X] open issues in our Github repo for each point of feedback
  - [ ] open a single issue in our Github repo for the entire review
  - [ ] leave review feedback as a comment in this issue and @-notify [github usernames]


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