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

Sorry to come back but i was checking the [SkateJS](http://skate.js.org/) library and i saw that in the todolist example on the homepage:

```
...
attached(elem) {
    // Setup the initial list of items from the current children.
    elem.items = elem.children;
  },
...
```
And attached() seems to rely on connectedCallback().

So i think it show the need to really clarify the situation - or - provide a real solution even requestAnimationFrame() could do the trick.

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