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There is one ad-hoc optimization here: if the state that changed is "hover", Gecko skips the entire process for elements that were never matched against a :hover simple selector before. See https://bugzilla.mozilla.org/show_bug.cgi?id=732667 for the background on this. | There is one ad-hoc optimization here: if the state that changed is "hover", Gecko skips the entire process for elements that were never matched against a :hover simple selector before. See https://bugzilla.mozilla.org/show_bug.cgi?id=732667 for the background on this. | ||
=== Handling of insertions and deletions === |
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