[w3ctag/design-reviews] Same-Origin iframe document-access limiting Feature Policy (#397)

こんにちはTAG!

I'm requesting a TAG review of:

  - Name: document-access feature policy
  - Specification URL: HTML Spec PR: https://github.com/whatwg/html/pull/4606

  - Explainer (containing user needs and example code)¹: https://github.com/dtapuska/documentaccess

  - GitHub issues (if you prefer feedback filed there): https://github.com/dtapuska/documentaccess/issues

  - Tests: pending
  - Primary contacts (and their relationship to the specification): @dtapuska

Further details:

  - Relevant time constraints or deadlines: None
  - [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](url).
  - [X] I have reviewed the TAG's [API Design Principles](https://w3ctag.github.io/design-principles/)
  - The group where the work on this specification is: WHATWG HTML

There is some debate in the one PR about the feasiblity of using feature policy for this definition and I believe it is fine. There is some desire to specify feature policies in meta tags but for this definition it is required to be in a header because it changes the agent cluster (which needs to be determined before the document is created).

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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