Improve <li> support in the HTML fast parser.
Blink merge: https://chromium-review.googlesource.com/c/chromium/src/+/4516018
Pull request: https://github.com/WebKit/WebKit/pull/16981
Committed 267207@main (26b96bce3e5f): <https://commits.webkit.org/267207@main> Reviewed commits have been landed. Closing PR #16981 and removing active labels.
<rdar://problem/114348908>