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

> Just as if you made a subtree then append it via appendChild.

It's not quite the same as that because in that case I can make my elements with `new ` and connect them together while they are custom elements (didn't need to be upgraded). I can detect this case (using `new `) fine, and can work with children the way I want.

And it also isn't the same initial-payload parser. Here's the issue, I made two fiddles showing the difference between initial-payload parser, and fragment parser:

- this first one shows your technique from https://github.com/w3c/webcomponents/issues/787#issuecomment-458456606 works in initial parsing: https://jsfiddle.net/trusktr/psw530mf/1/
- and here's the same fiddle modified to use `insertAdjacentHTML`, and you'll see based on the output that MO does not fire initially: https://jsfiddle.net/trusktr/psw530mf/2/

Seems like I need to detect the difference between the two, and in the second case I need to manually trigger child-handling logic.

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