Re: [dom] Having getElementsByTagName match on localName is not "web"-compatible for IE and Firefox (#143)

No, you would have both _input_ and _lowercaseInput_ and then for elements in the HTML namespace you would use _lowercaseInput_ and for other elements you would use _input_.

I might also introduce an element's qualified name concept to make this easier (analogous to attribute's qualified name concept) and also use that to define `tagName`.

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