Re: [w3c/webcomponents] connectedCallback timing when the document parser creates custom elements (#551)

> e.g. in the _constructor_ there are children during upgrades.

which is why I am personally promoting a different approach such:

```js
class HTMLCustomElement extends HTMLElement {
  constructor() {
    const self = super();
    self.init();
    return self;
  }
  init() {}
}
pos
// so that everyone can extend it via ...
class MyEl extends HTMLCustomElement {
  init() {
    // any logic previously used as
    // createdCallback();
  }
}
```

Afaik that logic should have `chindren` and delegate to `connectedCallback` / `disconnectedCallback` the only `addEventListener` / `removeEventListener` or direct `self` node related logic.

Yet this means that developers expectations might need a fix from standards which is usually undesired.

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