Re: [w3c/webcomponents] Style ::slotted children (#594)

> Note that we supported an arbitrary selector in ::content (in Shadow DOM v0) in Blink, as you are suggesting, however, we had experienced that it would make the implementation complicated and would be the root cause of a performance issue. Thus, we introduced this limitation to ::slotted intentionally.

This also feels like it would break encapsulation a bit too much. For example, if you were able to provide a deep selector for slotted elements, it would touch all descendants of all slotted nodes. Besides the performance implications, this feels like a double standard: nothing can reach in, but the shadow root can reach out.

@lukasoppermann since it's light DOM, couldn't you instead do:

```css
my-element input[checked] ~ .material-toggle__switch
```

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