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

I think that @DigiTec is no longer at Microsoft (right?) so I guess we can't expect any more data to inform the situation.

Because no engine except [Servo](https://github.com/servo/servo/blob/6d59be17bedbf9a96915b854df8ae8a0cd371831/components/script/dom/webidls/Attr.webidl) has attempted this yet nobody has a good idea about the likely compat fallout from this, but some pain seems very likely.

Based on https://www.chromestatus.com/metrics/feature/timeline/popularity/1034 we can say that `cloneNode()` is needed, and we don't know if the list ends there. As I mentioned in https://github.com/whatwg/dom/issues/102#issuecomment-193595334, it doesn't seem like a big simplification in Blink, and I assume the same is true in WebKit.

I think we should set a deadline for implementer interest to materialize, and if things remain unchanged abandon this simplification, keeping `Attr` in the gallery of silly things on the web platform.

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