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

>  I think (please let me know if I'm wrong) that due to Shadow DOM encapsulation that some (potentially custom) element being distributed into a slot will have no idea what slot that is,

You can use `Element.assignedSlot`: http://w3c.github.io/webcomponents/spec/shadow/#widl-Element-assignedSlot

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