Resync web-platform-tests/custom-elements
Pull request: https://github.com/WebKit/WebKit/pull/8434
Committed 258711@main (f0f68a84af35): <https://commits.webkit.org/258711@main> Reviewed commits have been landed. Closing PR #8434 and removing active labels.
<rdar://problem/104068909>
Re-opening for pull request https://github.com/WebKit/WebKit/pull/8452
Committed 258713@main (faaa5c24afb0): <https://commits.webkit.org/258713@main> Reviewed commits have been landed. Closing PR #8452 and removing active labels.