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

@treshugart Nevermind, I think I got it: for a given `<content>` element that we wish to observe for distribution changes, we can traverse up from it to find the shadow root host, then use `MutationObserver` on the host to detect changes in children, and whenever changes happen we just call `.getDistributedNodes()` on the `<content>` element to find the new distribution and compare against the previous result to determine if there was a change in distribution.

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