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

This is IE 11:
Attr : Node
Node implements EventTarget

This is Edge:
Attr : Node : EventTarget

However, as noted, our implementations of addEventListener/removeEventListener/dispatchEvent were broken on Attr types. So we can assume that even though they existed, usage of them would not have worked and thus there must not be a lot of usage.

Attr : Node is still a concern, and I see your points above about things like cloneNode not being on the new Attr. At this point in our cycle, super large changes wouldn't be possible so we would not be able to make this into our next release. However, I'm quite interested in moving this forward in as compatible a way as possible. Even if that means adding some methods to Attr temporarily that can be better use tracked. Right now all of my Node information can't be disambiguated (we don't annotate which derivation/typeid was invoked we only track the entrypoints which are on Node)

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