[Webkit-unassigned] [Bug 270664] New: @font-face rules in shadow trees should not leak outside to document

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=270664

            Bug ID: 270664
           Summary: @font-face rules in shadow trees should not leak
                    outside to document
           Product: WebKit
           Version: Safari 17
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: stearns at adobe.com

I have a PR up at WPT with a bunch of tests around @font-face and shadow trees:

https://github.com/web-platform-tests/wpt/pull/44993

These are based on the spec (https://drafts.csswg.org/css-scoping/#shadow-names) which WebKit gets right much more than the other engines (all but two of the tests pass) but @font-face names are meant to be tree-scoped, which WebKit does not do. So the two tests (001 and 005) that check that a @font-face rule defined in a shadow tree does not get used when referred to by the outside document fail in WebKit.

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