RuleSet::evaluteDynamicMediaQueryRules has complexity num(media queries) * num(style rules) for queries that flip value.
This can become significant for pages that have 1000s of media queries.
Created attachment 401995 [details]
Created attachment 401997 [details]
Committed r263092: <https://trac.webkit.org/changeset/263092>
All reviewed patches have been landed. Closing bug and clearing flags on attachment 401997 [details].