Re: [w3c/webcomponents] Discussion: child elements cannot determine whether they are "active" or not (#817)

I don't think detecting whether an element is slotted or not is sufficient since a parent node might be the one getting slotted as well.

In the past, there was a discussion about adding a callback to when a node gets "attached" in the sense of render tree in WebKit sense. That is when an element is visible (does not have `display: none`) part of a document.

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