Re: [w3c/webcomponents] How can a custom element detect when it is transcluded into a shadow tree? (#504)

> So slot-containing elements inside a shadow tree can still see what nodes are distributed into their slots (on `slotchange`) even if that shadow tree is closed?

Yes, it's okay for *Inner tree* to see *Outer tree*.
You might be interensted in the definition of [unclosed node](https://dom.spec.whatwg.org/#concept-unclosed-node). A lot of APIs (and concepts) are using this definition to decide its behavior.


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