Re: [whatwg/dom] Make element and attribute names behave like the HTML parser (#449)

I mean browsers. Browsers definitely care about the namespace of an attribute. And the problem with `setAttribute()` is that it doesn't care, so you might be accidentally overwriting a value of a namespaced attribute, while you were just trying to set a non-namespaced attribute. (This is only a problem for frameworks of course, and only for those that care about usually theoretical scenarios.)

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