Re: [w3c/webcomponents] [Custom]: Need callback for form submit data (bugzilla: 24603) (#187)

Custom elements F2F: we would like this! Previously, https://lists.w3.org/Archives/Public/public-webapps/2014JanMar/0448.html

Current thinking is:
- Probably this should be FormData based
- We should refactor the HTML spec to have "form data steps" per element to make the design a bit clearer (https://html.spec.whatwg.org/multipage/forms.html#constructing-form-data-set)
- Ideally we'd like to have a setValue/getValue pair so that this could also handle form restoration when doing back/forward/reopening the browser/etc.
- We're not sure how to best guide authors to having unique names for their fields. (E.g. using the name attribute or some derivative of it like type=image does with name + "x"/"y".)

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