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

Oh I see. I think what's confusing here is that you're mentioning the ordering only when you started talking about siblings.  I think it's better to clarify it up front before talking about child-parent relationship or omit it altogether since once child-parent relationship and sibling relationships are established, then tree order is [well defined](https://dom.spec.whatwg.org/#concept-tree-order)

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