headingoffset computation should not use the flat tree

[annevk]

Like the lang attribute it should use the composed tree. Or in other words, semantics should not be impacted by slotting.

• At least two implementers are interested (and none opposed):
  • WebKit
  • …
• Tests are written and can be reviewed and commented upon at:
  • headingoffset computation should not use the flat tree web-platform-tests/wpt#60525
• Implementation bugs are filed:
  • Chromium: N/A, not implemented yet
  • Gecko: N/A, not implemented yet
  • WebKit: https://bugs.webkit.org/show_bug.cgi?id=295092
• 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.)

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/sections.html ( diff )