They accept a <relative-selector-list> as their prelude (rather than just a <selector-list>). Such relative selectors are relative to :scope. Any selector in the <relative-selector-list> that does not start with a combinator but does contain the nesting selector or the :scope selector, is interpreted as a non-relative selector (but the subject must still be in scope to match). https://drafts.csswg.org/css-cascade-6/#scoped-style-rules https://github.com/w3c/csswg-drafts/issues/9621
<rdar://problem/118749004>
Pull request: https://github.com/WebKit/WebKit/pull/20930
Committed 271336@main (f658dff67d19): <https://commits.webkit.org/271336@main> Reviewed commits have been landed. Closing PR #20930 and removing active labels.