Andreas Kling eeab3671c2 LibWeb: Move attribute style invalidation into a helper ...

Element.cpp still encoded the CSS consequences of attribute changes:
class/id invalidation keys, pseudo-class triggers, and shadow-host
stylesheet fallout. Move that policy into AttributeInvalidator.

Element now reports attribute changes to the helper and exposes a small
state hook to remember removed attributes while invalidation is pending.

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

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