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

The use counter for cloneNode has now reached Chrome's stable channel:
https://www.chromestatus.com/metrics/feature/timeline/popularity/1034

Unfortunately, chromestatus.com is not feeling well, so @RByers has helped me check the usage internally, and says that it is 0.0007% of page views.

For something that's worked in all browsers for decades and that would start throwing exceptions, I don't think that just dropping it would be OK. So wither Attr has to add cloneNode, or it needs to inherit from Node again.

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