Andreas Kling 0ee13f9a82 LibWeb: Use targeted invalidation for @keyframes in added/removed sheets ...

@keyframes rules only affect elements that already reference the named
animation. Instead of falling back to a whole-subtree invalidation
when a sheet contains @keyframes, walk the sheet's @keyframes rules in
StyleSheetList::add_sheet/remove_sheet and reuse the existing per-rule
helper to dirty just the elements that reference each animation-name.

2026-05-07 19:32:27 +02:00

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