Per https://drafts.csswg.org/css-backgrounds-3/#background-clip
<rdar://problem/134389029>
Pull request: https://github.com/WebKit/WebKit/pull/33255
Committed 283482@main (21c075d2c09a): <https://commits.webkit.org/283482@main> Reviewed commits have been landed. Closing PR #33255 and removing active labels.
Committed 283286.28@safari-7620-branch (74cf8d885699): <https://commits.webkit.org/283286.28@safari-7620-branch> Reviewed commits have been landed. Closing PR #1757 and removing active labels.