Re: [w3c/webcomponents] "::slotted" pseudo elements (#331)

In 3.2.2,
```css
::slotted( <compound-selector>? )
```
> If the `<compound-selector>` is omitted, it defaults to the universal selector.

We haven't discussed this in this issue before, and when I implemented in Blink I made the `<compound-selector>` mandatory, not be omitted.  As `:host` has 2 forms (`:host` and `:host()`) and the latter the parameter is not omissible, the difference may be confusing.
@tabatkins, can this `<compound-selector>` be mandatory parameter and author must specify `*` explicitly if it wants?

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