Re: [w3c/webcomponents] Need a callback for when children changed or parser finished parsing children (#809)

> There appears to be a strong desire for having some callback when the parser finishes parsing children

This is exactly what this issue addresses, unfortunately it mixes it up with

> or when a new child is inserted or an old child is removed.

which is a completely different problem. I really think there is a strong necessity to solve the first problem first, because the second problem can already be tackled with using a `MutationObserver`.

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