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

This is 😢 for now. Trying to minimize flash of non-upgraded children:

```
export default class TimeagoElement extends HTMLElement {
  constructor() {
    super()
    if (this.querySelector('time')) {
      this.init()
    } else {
      window.requestAnimationFrame(() => {
        this.init()
      })
    }
  }
  ...
}
```

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