CSSSelector has some needlessly complex code for selector specificity with too much in the CSSSelector.h header.
<rdar://problem/102281644>
Pull request: https://github.com/WebKit/WebKit/pull/6435
Committed 256769@main (9adcbe8f12b9): <https://commits.webkit.org/256769@main> Reviewed commits have been landed. Closing PR #6435 and removing active labels.