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

Ah, thanks! I suppose we'd also need to patch `attachShadow` for the `"closed"` shadow roots, to store their hosts.

> I'd be interested to know what the exact use case is for detecting when a parser is creating a custom element. 

I was wondering if it would be helpful in any way for improving the [`MutationObserver`-based example of child connected/disconnected callbacks](https://github.com/w3c/webcomponents/issues/787#issuecomment-459829842).

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