Re: [WICG/webcomponents] How can a custom element detect when it is distributed, and what its composed parent is? (#941)

Maybe a better title is "mechanism for observing composed connections".

In my project that has cooperating custom elements, I've implemented `childComposedCallback` and `childUncomposedCallback`, which do exactly as you may guess. However, it falls apart when one of my elements is distributed into a non-cooperating element such as a non-custom element.

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