Re: [webcomponents] Clarification needed :root CSS pseudo class matches ShadowRoot or not (#338)

If we're considering the shadow root to be a DocumentFragment that is not selectable by CSS, then the end-consumer of shadow dom (everyday web developers) will never actually interact with, or need to know and care about, the shadow root node itself - it will just be a boundary that their selectors can't cross. I think that re-naming host element to root element is a good mental model for developers not savvy to the implementation under the hood.

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