Re: [w3c/webcomponents] Non-class based example of customElement.define() (#587)

> MutationObserver is not something which completes my requirement

Why? MutationObserver lets you observe when child elements are inserted or removed. That's exactly when you should be running the logic to update your container element.

In general, the idea of all children being ready is flawed since an element can be inserted or removed dynamically.

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