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

IMO, it'd be nice that (if this feature existed) that the `childConnected` and `childDisconnected` callbacks would be guaranteed to fire before the `connectedCallback`/`disconnectedCallback` of the children.

This would allow parents to set up certain things (for example pass a message or state to a child), then allow for the child to react to the message or state in `connectedCallback` without requiring async coordination. Specifically, a child could detect the absence of a message or state in `connectedCallback` in order to detect an invalid-parent case without polling.

Similar with [`distributedCallback`](https://github.com/w3c/webcomponents/issues/527) and detecting the invalid-slot-parent case.

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Received on Wednesday, 24 August 2016 07:00:14 UTC