A typo in the copy constructor of CSSSelector ("if" instead of "if else") introduced in this commit https://github.com/WebKit/WebKit/commit/70f39545176202167919e3ed0d88163bbcb9f786 can sometimes create buggy objects.
<rdar://problem/103723429>
Pull request: https://github.com/WebKit/WebKit/pull/8047
Committed 258339@main (a7844f97ea72): <https://commits.webkit.org/258339@main> Reviewed commits have been landed. Closing PR #8047 and removing active labels.