Resync web-platform-tests/dom from upstream.
Created attachment 450918 [details] Patch
Created attachment 450920 [details] Patch
Created attachment 450931 [details] Patch
Committed r289165 (246861@main): <https://commits.webkit.org/246861@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 450931 [details].
<rdar://problem/88532716>