Re: [whatwg/dom] Declarative Shadow DOM (#510)

> The spec explicitly states which elements can accept a shadow root in the attachShadow() invocation steps here: https://dom.spec.whatwg.org/#dom-element-attachshadow.

Yep. So if I read it right, using `div` would return an error (or at least the `shadowroot` will not work) because you can't attachShadow on it: (See number 2)

> It's most likely that if a shadow root is declared that they're rendering similar, if not the same things, and are using it for the purposes of server-rendering.

I think this is a better path on having `shadowroot`. I think it should be the SSR system's job to compute the eventual shadowDOM of an element and create a `shadowroot` tag and not the author. The author's job is to still use the usual way of defining a shadowDOM which is to use the `attachShadow` method.

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