Re: [w3c/webcomponents] Having slots as element prevents styling empty containers (#701)

Am I understanding this correctly?

```css
my-layout-component:not(:has(slot:has-assigned)) {
  display: none;
}
```

Would be pretty close. Only, there's no `:has-assigned` specified yet and `:has` won't actually work for this purpose because it's not part of the live profile?

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