Resync web-platform-tests/html from upstream.
Created attachment 442738 [details] Patch
Created attachment 442759 [details] Patch
Created attachment 442813 [details] Patch
Created attachment 442830 [details] Patch
Created attachment 442857 [details] Patch
Created attachment 442979 [details] Patch
Created attachment 442997 [details] Patch
Created attachment 443306 [details] Patch
<rdar://problem/85030105>
Created attachment 443368 [details] Patch
Created attachment 443391 [details] Patch
Committed r285346 (243907@main): <https://commits.webkit.org/243907@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 443391 [details].