Move HTML fast parsing from createFragmentForMarkup() to DocumentFragment::parseHTML().
Pull request: https://github.com/WebKit/WebKit/pull/10315
Committed 260519@main (49be8f24f1f7): <https://commits.webkit.org/260519@main> Reviewed commits have been landed. Closing PR #10315 and removing active labels.
<rdar://problem/105636012>