Re: [whatwg/dom] Make Attr inherit from Node again (#299)

Most APIs will already throw `HierarchyRequestError` indeed. `observe()` doesn't seem to throw in implementations, but doesn't do anything either since we only ever queue attribute mutation records for elements. @smaug---- @dominiccooney @travisleithead @cdumez should we make `observe()` throw when passed an `Attr` node or just let it be useless as it is today?

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Received on Wednesday, 17 August 2016 08:48:00 UTC