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

For the record, here is my opinion as well:
- Document continues to return a Document (not a HTMLDocument or XMLDocument) whose type is "xml".
- 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).
- Bring back HTMLDocument because unlike SVGDocument / XMLDocument, it has a decent amount of API that is only meaningful for HTML documents (e.g. document.write(), document.open()), or legacy API that I don't really want to expose to more document types (e.g. document.all(), document.bgColor).
- Add a constructor to HTMLDocument

If a major browser besides Edge actually manages/decides to move everything from HTMLDocument to Document, then I could be convinced otherwise. However, it has been years and it has not happened. I personally do not think the "benefits" of merging HTMLDocument into Document are worth the effort / risks involved.

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