Instead of validating the element name first and then looking up the element factory, look up the element factory first and then only fallback to parsing the qualified name if that failed.
Pull request: https://github.com/WebKit/WebKit/pull/19078
Committed 269388@main (0a209521829e): <https://commits.webkit.org/269388@main> Reviewed commits have been landed. Closing PR #19078 and removing active labels.
<rdar://problem/117043276>