WIP: Public subresource check

[noamr]

• [ ] At least two implementers are interested (and none opposed):
  • …
  • …
• [ ] Tests are written and can be reviewed and commented upon at:
  • …
• [ ] Implementation bugs are filed:
  • Chromium: …
  • Gecko: …
  • WebKit: …
  • Deno (not for CORS changes): …
• [ ] MDN issue is filed: …

(See WHATWG Working Mode: Changes for more details.)

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[noamr]

Not pursuing this atm.