Re: [webcomponents] Remove the constraint that slot can't have another slot as an ancestor (#321)

Yeah, the fallback case would make sense. That wouldn't cause an issue.

In any other cases, it doesn't make sense to allow the nesting. e.g.

```html
<slot id=s1 name=foo>
  <div> 
    <span id=s2>
      <slot id=s3 name=bar></slot>
    </span>
  </div>
</slot>
```

Can we merge this issue to https://github.com/w3c/webcomponents/issues/317 ?

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