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

@dstorey, the spec for this is https://html.spec.whatwg.org/multipage/window-object.html#htmldocument, which would mean that `window.HTMLDocument===window.Document`, ad-hoc test in https://jsbin.com/kidewim. Edge fails that way in the way one would suspect from the pasted IDL, namely that HTMLDocument is a distinct interface.

However, it's the same empty interface in Blink:
https://cs.chromium.org/chromium/src/third_party/WebKit/Source/core/html/HTMLDocument.idl

And almost empty in WebKit:
https://trac.webkit.org/browser/webkit/trunk/Source/WebCore/html/HTMLDocument.idl

But still lots of stuff in Gecko:
https://github.com/mozilla/gecko-dev/blob/master/dom/webidl/HTMLDocument.webidl

The situation is similar for XMLDocument:
https://cs.chromium.org/chromium/src/third_party/WebKit/Source/core/dom/XMLDocument.idl
https://github.com/mozilla/gecko-dev/blob/master/dom/webidl/XMLDocument.webidl
https://trac.webkit.org/browser/webkit/trunk/Source/WebCore/dom/XMLDocument.idl

http://web-confluence.appspot.com/ is also a good way to check this, but the HTMLDocument changes seem recent so haven't reached stable yet.

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