Re: [whatwg/dom] MutationObserver needs an equivalent of disconnected & connected callbacks (#533)

@rniwa what you described looks more like a `blur` related bug (either browser or specs) but I'm happy you found a concrete use case.

Another one I have these days is a declarative way for an element inside a template to perform setup operations without needing its container to know about these

```html
<tempalte>
  <div>
    One <span>or more</span> elements and then
   <p
    class="timer"
    onconnected="this.textContent = (new Date).toLocaleString()"
  > time </p>
  </div>
</template>
```

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