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

@dflorey `ElementInternals` is a helper for custom element authors, and browsers never call its methods internally.

Overriding `reportValidity()` is easy.  We can just add our own `reportValidity()` to the custom element class.  However, we have no ways to override [interactive validation](https://html.spec.whatwg.org/C/#interactively-validate-the-constraints) UI.  It's an issue of not only form-associated custom elements, but also built-in form controls.
I recommend to file a new issue on https://github.com/whatwg/html/issues .


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