[Webkit-unassigned] [Bug 249706] New: The :checked pseudoselector styles not applied immediately for slotted input element. Keyboard interaction only.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=249706

            Bug ID: 249706
           Summary: The :checked pseudoselector styles not applied
                    immediately for slotted input element. Keyboard
                    interaction only.
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Intel)
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: istvantutto at gmail.com

Hey team! 

I've noticed that a checkbox element's :checked state styles will not be immediately applied when using a keyboard (SPACE) to select it and the styles are coming from within a ShadowDom's `::slotted(...)` selector. The styles will be applied after blur event only. The pointer interaction works as expected and all other major browsers handle the keyboard event as well.

Demonstration in link:
https://codepen.io/istutto/pen/eYjmywN

Note, that the above mentioned case will be resolved in Safari as well if the following empty rule as added into the light-DOM.
```css
input[type=checkbox]:checked {}
```

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