NEW 296577
CSS rules with :host() inside :is() inside :not() are not applied in shadow DOM 
https://bugs.webkit.org/show_bug.cgi?id=296577
Summary CSS rules with :host() inside :is() inside :not() are not applied in shadow DOM
Dmitry Sharabin
Reported 2025-07-28 10:21:02 PDT
Reduced testcase: https://codepen.io/dmitrysharabin/pen/ogjYbBv Doesn't work in Safari Technology Preview Release 224 (WebKit 20622.1.20.1) either. Works in Chrome and Firefox.
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Radar WebKit Bug Importer
Comment 1 2025-08-04 10:21:14 PDT
<rdar://problem/157486070>
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