Re: [webcomponents] Define the behavior of '::slotted' (the former name is '::content'). (#331)

"::slotted" is used to style a distributed node directly, having a more power.

e.g.
```css
slot::slotted(div.red) {
  color: red;
}
slot::slotted(div.green) {
  color: green;
}



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