Expose everywhere

[Ms2ger]

Ref: tc39/proposal-shadowrealm#331

• At least two implementers are interested (and none opposed):
  • Positive initial signals from Google, Apple, Mozilla on the general direction.
• Tests are written and can be reviewed and commented upon at:
  • …
• Implementation bugs are filed:
  • Chrome: https://bugs.chromium.org/p/chromium/issues/detail?id=1281880
  • Firefox: https://bugzilla.mozilla.org/show_bug.cgi?id=1747059
  • Safari: https://bugs.webkit.org/show_bug.cgi?id=234554

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

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[MattiasBuelens]

Neat! This could help to remove some ugly hacks around running IDL harness tests in non-browser environments, like this abomination in Node. 😁

[ricea]

Looks good once whatwg/webidl#526 is landed.

[Ms2ger]

This should be ready to merge now; I'll submit tests to WPT once the IDL changes have propagated from webref.