Andreas Kling 4b3abc6958 LibWeb: Move invalidation set matching into a helper ...

Element.cpp still contained the CSS logic for deciding whether an
invalidation set references features present on an element. Move that
matcher into CSS::Invalidation::InvalidationSetMatcher.

The helper uses Element's public API for classes, id, attributes,
pseudo-class state, and removed-attribute tracking. This keeps Element
focused on DOM state while CSS::Invalidation owns selector feature
matching.

2026-04-29 15:47:23 +02:00

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