[Webkit-unassigned] [Bug 265289] New: [css-scoping] Scoped style rules accept relative selector list (relative to :scope)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=265289

            Bug ID: 265289
           Summary: [css-scoping] Scoped style rules accept relative
                    selector list (relative to :scope)
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: m_dubet at apple.com

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

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