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

In the case that a shadow root is created in the unknown future and while no shadow root exists so therefore a light-tree `motor-node` has no way to determine if it will ultimately be distributed into a proper location, then maybe I should just throw a warning about the fact that the `motor-node` is not currently attached to another `motor-node` and tell about the possibility that the `motor-node` may not get distributed into another `motor-node`.

I'd like for these errors/warnings to link to some documentation that I'll have online.

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