Re: [w3c/webcomponents] Need callback for form submit data (#187)

Here are two points I made during F2F:
1. I'm very much uncomfortable executing any scripts during validation because we update the validation states when it's not safe to run scripts.
2. Setting custom validation error message would open up a can of worms. For starters, there needs to be an API to specify where the error message should be shown relative to the element's bounding rect.

We also couldn't come to agreement as to whether we allow non-element participants and whether it's okay to have a different API for element case and non-element case.

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