Using Shadow DOM @host rule with :scope pseudo-selector

I wanted clarification on the meaning of @host rules [1] in combination
with the :scope pseudo selector [2].

Am I correct in assuming that if I wanted to style the host element, and
only the host element, I could apply these features in combination this way?

@host {
  :scope {
    border: 1px solid orange;
  }
}

I think that is awesome.

It might be clearer whether these features combine in this way if the
Shadow DOM spec mentioned @host establishing the "contextual reference
element set" mentioned in the CSS 4 Selectors spec.

Regards,

Dominic

[1] <
https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#host-at-rule
>
[2] <http://dev.w3.org/csswg/selectors4/#scope-pseudo>



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