Resync imported/w3c/web-platform-tests/html/webappapis WPT tests from upstream.
Created attachment 381685 [details] Patch
Comment on attachment 381685 [details] Patch r=me once bots are green
Created attachment 381691 [details] Patch
Comment on attachment 381691 [details] Patch Clearing flags on attachment: 381691 Committed r251481: <https://trac.webkit.org/changeset/251481>
All reviewed patches have been landed. Closing bug.
<rdar://problem/56546645>