[Bug 19431] Namespace of elements made via .createElement() in XML documents must be null

https://www.w3.org/Bugs/Public/show_bug.cgi?id=19431

--- Comment #12 from Aryeh Gregor <ayg@aryeh.name> ---
I wrote a comment, but either I didn't submit it or it vanished.  I wrote
tests, which test for the HTML namespace if .contentType is "text/html" or
"application/xhtml+xml" and null otherwise:

http://w3c-test.org/webapps/DOMCore/tests/submissions/AryehGregor/Document-createElement-namespace.html

IE10 Developer Preview: 45/46 in both IE10 and IE9 mode; also returns HTML
namespace if you do .createDocument(htmlNamespace, "html",
null).createElement("x"), although the .contentType is still "application/xml"
Firefox 19.0a1: 46/46
Chrome 23 dev: 42/46; also returns the HTML namespace for application/xml if
the original root element had the HTML namespace
Opera 12.50 internal: 24/46; uses a totally different algorithm, as discussed

I think this is not substantially more complicated and much more closely
matches what browsers do.  Are there any objections to changing the spec to
match this approach, or do we want browsers to change here?

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