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

> > I think this needs to be a custom element reaction callback.
> That's probably limiting. I feel that this is in the same boat as the connect/disconnect reaction that we were asking for last week during the F2F, something a lot more generic.

For general nodes, you can just use MutationObserver. If you wanted it sooner, then that's a discussion that has to happen in https://github.com/whatwg/dom/issues/533

> Now, if we were to add a new reaction callback, will that callback be invoked even when the CE is not connected to the DOM?

You mean when it's not connected to a document? If so, then yes. There is no reason to restrict this `childChangedCallback` to the connected nodes.

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