Re: [whatwg/dom] Composed tree infrastructure (#725)

The composed tree is the tree of trees. Features such as [`composedPath`](https://dom.spec.whatwg.org/#dom-event-composedpath) and `Event`'s [`composed`](https://dom.spec.whatwg.org/#dom-event-composed) IDL attribute use the term to refer to that very concept.

I think adding the definition back to the DOM spec makes a lot of sense. I'm seeing that more and more features really need to refer to the composed tree, and not the flat tree because the latter doesn't have any of the nodes that were replaced by shadow roots but most of DOM APIs need to be well defined for all nodes, not just ones in the flat tree.

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