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

@hayatoito 

>  On getting, the attribute must return the assigned slot of the context object, if there is, and the assigned slot's root's mode is "open". *Otherwise must return null.*

What if it's closed? My problem is that to construct an efficient WebGL tree from my HTML interface, I need to mirror the flat tree if I want the WebGL portion to match with it. But at the same time, I can't tell ever developer to leave their shadow root open, and nor can one who is merely re-using components make the guarantee about all the components they use having open shadow trees.

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