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LibWeb: Invalidate less elements affected by CSS custom properties

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Before this change, whenever element's attributes changed, we would add
a flag to "pending invalidation", indicating that all descendants whose
style uses CSS custom properties needed to be recomputed. This resulted
in severe overinvalidation, because we would run invalidation regardless
of whether any custom property on affected element actually changed.

This change takes another approach, and now we decide whether
descendant's style needs to be recomputed based on whether ancestor's
style recomputation results in a change of custom properties, though
this approach adds a little overhead to style computation as now we have
to compare old vs new hashmap of custom properties.

This brings substantial improvement on discord and x.com where, before
this change, advantage of using invalidation sets was lost and we had
to recompute all descendants, because almost all of them use custom
properties.
This commit is contained in:
Aliaksandr Kalenik 2025-07-27 19:41:21 +02:00 • committed by Andreas Kling
commit d1fbb7b51e
Notes: github-actions[bot] 2025-07-30 09:07:23 +00:00
13 changed files with 71 additions and 67 deletions
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6
Libraries/LibWeb/CSS/Parser/ValueParsing.cpp
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@ -4339,8 +4339,10 @@ NonnullRefPtr<CSSStyleValue const> Parser::resolve_unresolved_style_value(Parsin
NonnullRefPtr<CSSStyleValue const> Parser::resolve_unresolved_style_value(DOM::AbstractElement& element, GuardedSubstitutionContexts& guarded_contexts, PropertyIDOrCustomPropertyName property, UnresolvedStyleValue const& unresolved)
{
// AD-HOC: Report that we might rely on custom properties.
// FIXME: This over-invalidates. Find a way of invalidating only when we need to - specifically, when var() is used.
element.element().set_style_uses_css_custom_properties(true);
if (unresolved.includes_attr_function())
element.element().set_style_uses_attr_css_function();
if (unresolved.includes_var_function())
element.element().set_style_uses_var_css_function();
// To replace substitution functions in a property prop:
auto const& property_name = property.visit(