Resync web-platform-tests/html/browsers & web-platform-tests/html/dom tests from upstream.
Created attachment 413217 [details] Patch
Created attachment 413304 [details] Patch
Created attachment 413318 [details] Patch
Committed r269451: <https://trac.webkit.org/changeset/269451> All reviewed patches have been landed. Closing bug and clearing flags on attachment 413318 [details].
<rdar://problem/71084290>