Add top-level site to environment. (#8014)

[wanderview]

• At least two implementers are interested (and none opposed):
  • …
  • …
• Tests are written and can be reviewed and commented upon at:
  • …
• Implementation bugs are filed:
  • Chrome: …
  • Firefox: …
  • Safari: …
  • Deno (only for timers, structured clone, base64 utils, channel messaging, module resolution, web workers, and web storage): …
  • Node.js (only for timers, structured clone, base64 utils, channel messaging, and module resolution): …

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

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/browsing-the-web.html ( diff )
/webappapis.html ( diff )
/window-object.html ( diff )
/workers.html ( diff )

[wanderview]

This initial attempt does not incorporate any authority container struct. This is consistent with the current monkeypatch spec for nonce here:

https://wicg.github.io/anonymous-iframe/#spec-environment-partition-nonce

If this lands we should update whatwg/storage#144 to use top-level site instead of top-level origin.

[wanderview]

This will also need a follow-up to set top-level site on the environment for service workers.