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

@tabatkins 

> > Does appendChild(document.createElement('shadow-root')) work?

> No, this is a parse-time operation. Post-parsing, the shadowroot element is dead, identical to a plain template. If you have JS, just use attachShadow(). ^_^

So what *should* `appendChild(document.createElement("shadowroot"))` do? Throw?

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