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

@franktopel the `attributeChangedCallback` is triggered as soon as the **beginning** of the node is known, AKA the opening tag.

Differently from `connectedCallback` or whatever children watcher we want, the `attributeChangedCallback` will never trigger when one attribute is known but another one isn't ,because `attributeChangedCallback` is consistent in triggering when all attributes on the opening tag are known, instead of randomly in the wild without any signal all nodes are known, which is what my proposal addresses.

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