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

> Mutation observer callbacks should in theory always happen before rendering.

I didn't know this, meaning the following pattern should grant the element has been parsed, right?

```js
constructor() {
  new MutationObserver((, mo) => {
    mo.disconnect();
    this.finishedParsingChildrenCallback();
  }).observe(this, {childList: true});
}
```

if that's the case, I might update my `html-parsed-element` library then, yet @rniwa concern on abusing MO all over will still be valid, and I wish myself there was a `finishedParsingChildrenCallback` or similar method for CE instantiation.

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