Re: [w3c/webcomponents] CustomElements: upgrade runs connectedCallback on an element with a throwing constructor (#563)

It would be no problem to drain the queue of these failed elements.

FWIW I think there may always be elements running around whose constructors threw, though; they can be created with 'new' which calls super(), discloses 'this', and then throws. We must continue to run callbacks for them because there's no effective way to detect them, that I know of.

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