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327dc8e82a
Instead of checking all elements in a document for containment in `:has()` invalidation set, we could narrow this down to ancestors and ancestor siblings, like we already do for subject `:has()` invalidation. This change brings great improvement on GitHub that has selectors with non-subject `:has()` and sibling combinators (e.g., `.a:has(.b) ~ .c`) which prior to this change meant style invalidation for whole document.