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LibWeb: Avoid many style invalidations on DOM attribute mutation

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Many times, attribute mutation doesn't necessitate a full style
invalidation on the element. However, the conditions are pretty
elaborate, so this first version has a lot of false positives.

We only need to invalidate style when any of these things apply:

1. The change may affect the match state of a selector somewhere.
2. The change may affect presentational hints applied to the element.

For (1) in this first version, we have a fixed list of attribute names
that may affect selectors. We also collect all names referenced by
attribute selectors anywhere in the document.

For (2), we add a new Element::is_presentational_hint() virtual that
tells us whether a given attribute name is a presentational hint.

This drastically reduces style work on many websites. As an example,
https://cnn.com/ is once again browseable.
This commit is contained in:
Andreas Kling 2024-12-23 17:51:10 +01:00 • committed by Andreas Kling
parent b11bdd4022
commit b981e6f7bc
Notes: github-actions[bot] 2024-12-24 16:18:00 +00:00
56 changed files with 377 additions and 37 deletions
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1
Libraries/LibWeb/HTML/HTMLInputElement.h
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@ -227,6 +227,7 @@ private:
void type_attribute_changed(TypeAttributeState old_state, TypeAttributeState new_state);
virtual bool is_presentational_hint(FlyString const&) const override;
virtual void apply_presentational_hints(GC::Ref<CSS::CascadedProperties>) const override;
// ^DOM::Node