Re: [w3c/webcomponents] Is there a way to detect if a custom element was constructed during parsing? (#789)

Thanks guys! Are there any edge cases that `this.isConnected && this.parentNode` won't catch?

How would you recommend polyfilling `isConnected`? Is the best way to traverse upward until we find a document? What about with shadow roots? Support for `isConnected` is currently low.

In my MutationObserver-based childConnected/DisconnectedCallback example I used my own `isConnected`, but it is set in `connectedCallback`.

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