Re: [w3c/webcomponents] [idea] childConnectedCallback and childDisconnectedCallback (#550)

> if the MutationObserver is created in connectedCallback, then it doesn't fire for children during parsing.

nobody said that is the place indeed and you should add the observer within the constructor.

The connected/disconnected can be either a flag or a dumb `this.ownerDocument.contains(this)` that is an evergreen synchronous check for connected nodes

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