Re: [webcomponents] Need "slotting changed" event (#288)

MutationObserver doesn't work since a slot may be the child of an element with a shadowRoot. In this case, the child list of the element may not change but the elements that are rendered in place of the element's slot do change.

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https://github.com/w3c/webcomponents/issues/288#issuecomment-124243076