Re: [dom] Make Attr a Node again (#102)

Yeah, doing just the IDL change as a first step makes sense. Other than things that implicitly depend on `attr instanceof Node` being true (throwing TypeError) you might also have things assuming that various attributes and methods of Node being available, and cloneNode() has been mentioned:
https://lists.w3.org/Archives/Public/public-html/2015May/thread.html#msg90

While it does seem risky to just make the change and ship it to stable, *something* could perhaps be learned by making it in between two branch points to see if there are reports from canary and dev. If there are many reports, then it's just game over, and otherwise we still don't know :)

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