The popup element has been replaced by the popover attribute, this commit resyncs with upstream and removes outdated WPTs.
<rdar://problem/105409097>
Pull request: https://github.com/WebKit/WebKit/pull/10050
Committed 260215@main (c2d61677931d): <https://commits.webkit.org/260215@main> Reviewed commits have been landed. Closing PR #10050 and removing active labels.