[whatwg] Node inDocument

[Bjoern Hoehrmann]

* Erik Arvidsson wrote:
>compareDocumentPosition is a terrible API but I guess there is nothing
>preventing implementors to optimize the case where one node is the
>document.

There is a proprietary Element.contains method implemented by some. The
method could be put on the Document interface in which case you could do
`node.ownerDocument.contains(node)` which seems quite fair.
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