Re: [whatwg/dom] Clarify that new Document creates a document of type "html", not "xml" (#308)

> Update the DOM spec so that XMLDocument becomes an alias to Document (WebKit / Blink used to do this until they introduced the XMLDocument type to align with the spec. However, given that XMLDocument brings nothing on non-Gecko browsers, I'd love to go back to it being an alias).

Oh, how did I miss this? It looks like it was none other than @cdumez who added XMLDocument to Blink and WebKit, and recently too:
https://bugs.chromium.org/p/chromium/issues/detail?id=238372
https://bugs.webkit.org/show_bug.cgi?id=153378

Given that, it seems *very* likely that it can be made an alias of Document again in non-Gecko engines again, but if Gecko can't follow we'll be stuck in a weird place.

If not for the risk for Gecko, everything in https://github.com/whatwg/dom/issues/308#issuecomment-247636495 SGTM, including keeping a few things on HTMLDocument that would always throw on Document.

@bzbarsky, how do you view the chances that making XMLDocument an alias of Document in Gecko would be web compatible today? What was the original issue?

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