:has-slotted
Matches a 'slot' in the Shadow DOM if it contains content that matches the selector. It's used within Web Components to style slots based on what's been put inside them.
Quick example
/* Styles the slot if it has an image inside it */
::slotted(div):has-slotted(img) {
border: 4px solid blue;
}:has-slotted Browser Support
Limited availability 2% global usage
This feature is not Baseline because it does not work in some of the most widely-used browsers.
Not ready for production without a fallback.
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