[Webkit-unassigned] [Bug 229438] New: Incorrect specificity with ::slotted

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=229438

            Bug ID: 229438
           Summary: Incorrect specificity with ::slotted
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jeroen.zwartepoorte at gmail.com

https://codepen.io/jpzwarte/pen/oNwNdpN?editors=0110

In Chromium and Firefox, the background is hotpink. In Safari and STP, the background is green.

This is the CSS for the web component:
```css
      :host([foo]) ::slotted(h1) {
        --background: hotpink;
      }
      ::slotted(h1) {
        --background: green;
      }

```

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