Re: [whatwg/dom] Un-merge Document and HTMLDocument (#221)

@annevk will know, but probably the original motivation was that it's possible to insert any element into any document, so having a type of the document itself doesn't achieve much. Also, I think, to reduce gratuitous differences between XHTML (XMLDocument) and HTML. (Some algorithms still have different behavior based on the document type, though.)

Whatever the history, we're now in a weird state and need to plot a course towards interop. Does at least trying to make HTMLDocument empty seem reasonable? Given the changes already made in Blink and Edge, this is very likely web compatible.

Whether to attempt the final step of aliasing I don't know. If we don't, we may need to rethink the Document constructor, perhaps instead making it such that HTMLDocument and XMLDocument are the only possible instances.

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