Re: [w3c/webcomponents] Discussion: child elements cannot determine whether they are "active" or not (#817)

@rniwa @domenic @annevk any opinion on this? This happens to be one of the points mentioned by Rich Harris in his post. We need to have a reliable way to avoid carrying on a lot of operations for fragments of the DOM that are not slotted. Until now, `Element.isConnected` was sufficient (although not observable), but with the introduction of the ShadowDOM, this isn't a reliable way anymore. As for custom elements, connectedCallback (which could be considered analogous to `isConnected`) is not sufficient.

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