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

The solution to this problem is to have parent elements observe which children are attached to them or which children are attached to their slots when the parent is in a ShadowDOM tree. This is better than my current design where children observe parents in order to determine if child was attached to a correct parent, which doesn't work in closed Shadow trees because the child can't see the parent the slot where it is distributed into.

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