Re: [w3c/webcomponents] createElement and createElementNS() should check is attribute (#466)

Part of the question here is what the parser should do when encountering `<button is="x">`, or even `<button is="un-defined">`. Should it give a `HTMLUnknownElement`, or a `HTMLButtonElement`? I think I lean toward `HTMLButtonElement` since for `<button is="un-defined">` that is clearly what we want (to allow later upgrades).

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