Re: [whatwg/dom] Adding .closest() to more nodes (#161)

I think there are many properties like this, but for historical reasons they have ended up on `Attr` too. And for historical reasons `DocumentType` is a thing as well.

I guess we have two options here:

1. Just use `Node`.
2. Define a new `TreeNode` mixin that excludes `Attr`. (It seems we include `DocumentType` for other new mixins, such as `ChildNode`.)

I'm inclined to go with 2 if we still want to do this.

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