headingoffset computation should not use the flat tree#60525
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https://bugs.webkit.org/show_bug.cgi?id=295092 rdar://155028047 Reviewed by NOBODY (OOPS!). They are implemented behind the HeadingOffsetEnabled feature flag (preview). The complexity of the feature lies in correctly invalidating the :heading pseudo-class. Tests: imported/w3c/web-platform-tests/css/selectors/invalidation/heading-pseudo-class-in-has-with-headingoffset.html imported/w3c/web-platform-tests/css/selectors/invalidation/heading-pseudo-class-in-has-with-slot-reassignment.html imported/w3c/web-platform-tests/html/semantics/sections/headingoffset-and-headingreset.html imported/w3c/web-platform-tests/html/semantics/sections/headingoffset-mutations.html Upstream: web-platform-tests/wpt#60525
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See whatwg/html#12562 for context.