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

So, it does not make much sense for `Document`, `DocumentType`, `DocumentFragment`, `ShadowRoot`, and `Attr`, if it comes back as a node, but it seems there's at least a use case for `Document`. And if `Document` makes sense, even if it only ever returns null, so does `ShadowRoot`.

If we put it on node we should probably use `[Unscopable]`.

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