Re: [w3c/webcomponents] Non-class based example of customElement.define() (#587)

Note that in general custom elements are upgraded in the tree order (prefix DFS), and connected & disconnected callbacks are enqueued in the tree order as well so in `connectedCallback`, for example, you shouldn't expect to be able to talk to your child elements / nodes. The recommended paradigm is for each child custom element to notify its parent. If you had to observe other kinds of changes or have to accept non-custom element, the recommendation is to use MutationObserver. 

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