Resync web-platform-tests/html/dom & web-platform-tests/html/infrastructure from upstream.
Created attachment 403416 [details] Patch
Comment on attachment 403416 [details] Patch Please check iOS failure (may need a specific rebaseline)
Created attachment 403470 [details] Patch
Committed r263903: <https://trac.webkit.org/changeset/263903> All reviewed patches have been landed. Closing bug and clearing flags on attachment 403470 [details].
<rdar://problem/65081058>