Re: [webcomponents] The order of node trees is not well defined when one tree is not inside a shadow tree (#302)

The spec defines parent-child relationship.

> A node tree A is called a parent tree of a node tree B if B is a shadow tree and the shadow host which hosts B participates in A.

1. parent-child relationship
2. order between siblings

1 and 2 are enough to define the tree order, I think.

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https://github.com/w3c/webcomponents/issues/302#issuecomment-137308355