Re: [whatwg/dom] createElementNS() QName/Name confusion (#671)

@cscott You state:

> On the other hand, document.createElementNS("http://example.com", ":foo") ought to throw a NAMESPACE_ERR (test case ine 56) yet there is no spec language to justify this: if it failed the "validate qualifiedName" test it ought to throw a INVALID_CHARACTER_ERROR, and steps 5 and 6 state: [...]

I believe this example is an ambiguous case that could also be taken to mean: it matched the `Name` production (where colons are allowed as `NameStartChar`), but non-null `namespaceURI` was passed, hence the `NAMESPACE_ERR`.

The specs for `Document#createElementNS()` are currently pretty lenient as to what combinations of arguments are allowed, particularly where allowing the creation of non-namespaced elements is concerned. It's a bit counter-intuitive to me, when the method name (`...NS()`) seems to suggests it is specifically aimed at creating namespaced element.

So, I agree the specs could use some further clarification, or perhaps reevaluation as what should be allowed and what not.

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