Andreas Kling f35152cf61 LibWeb: Defer entire-subtree style invalidations ...

Instead of traversing the entire DOM subtrees and marking nodes for
style update, this patch adds a new mechanism where we can mark a
subtree root as "entire subtree needs style update".

A new pass in Document::update_style() then takes care of coalescing
all these invalidations in a single traversal of the DOM.

This shaves *minutes* of loading time off of https://wpt.fyi/ subpages.

2025-01-26 22:58:42 +01:00

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