Make the muted content attribute a fallback

[annevk]

And align the muted getter with the :muted pseudo-class.

This also cleans up how we organize all the muted state. This removes the reliance on "creation-time" of the element which is completely bogus as whenever an element is created it has exactly 0 attributes.

Fixes #5013.

• At least two implementers are interested (and none opposed):
  • WebKit
  • …
• Tests are written and can be reviewed and commented upon at:
  • HTML: make muted attribute no longer rely on non-existing element creation-time web-platform-tests/wpt#59322
• Implementation bugs are filed:
  • Chromium: …
  • Gecko: …
  • WebKit: …
• Corresponding HTML AAM & ARIA in HTML issues & PRs: N/A
• MDN issue is filed: N/A
• The top of this comment includes a clear commit message to use.

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

---

/media.html ( diff )