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LibWeb: Use invalidation sets for :has() invalidation
Prior to this change, we invalidated all elements in the document if it used any selectors with :has(). This change aims to improve that by applying a combination of techniques: - Collect metadata for each element if it was matched against a selector with :has() in the subject position. This is needed to invalidate all elements that could be affected by selectors like `div:has(.a:empty)` because they are not covered by the invalidation sets. - Use invalidation sets to invalidate elements that are affected by selectors with :has() in a non-subject position. Selectors like `.a:has(.b) + .c` still cause whole-document invalidation because invalidation sets cover only descendants, not siblings. As a result, there is no performance improvement on github.com due to this limitation. However, youtube.com and discord.com benefit from this change.
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github-actions[bot]
2025-01-29 08:31:17 +00:00
Author: https://github.com/kalenikaliaksandr
Commit: d762d16938
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3391
8 changed files with 56 additions and 9 deletions
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@ -586,7 +586,11 @@ Vector<MatchingRule const*> StyleComputer::collect_matching_rules(DOM::Element c
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auto const& selector = rule_to_run.selector;
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SelectorEngine::MatchContext context { .style_sheet_for_rule = *rule_to_run.sheet };
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SelectorEngine::MatchContext context {
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.style_sheet_for_rule = *rule_to_run.sheet,
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.subject = element,
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.collect_per_element_selector_involvement_metadata = true,
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};
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ScopeGuard guard = [&] {
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if (context.did_match_any_hover_rules)
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did_match_any_hover_rules = true;
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