Re: [whatwg/dom] Node.prototype.rootNode is not Web compatible (#241)

The semantics is very different. A node always belongs to a document regardless of whether it's in a document or not, and this is where the term "owner" comes from.

On the other hand, the root of a tree is the node or its highest ancestor, which could change multiple times over the lifetime of the node.  It doesn't own any of its nodes.

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