The main point of the css-scoping is to ensure that the matched element is contained in the scope donut. https://drafts.csswg.org/css-cascade-6/#scoped-style-rules
<rdar://problem/118713295>
Pull request: https://github.com/WebKit/WebKit/pull/20852
Committed 271104@main (ee0320f9080b): <https://commits.webkit.org/271104@main> Reviewed commits have been landed. Closing PR #20852 and removing active labels.