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

Proposal A and B in the document are NOT exclusive. My current opinion is that we should provide both.

We should make consensus step by step.

1. Should we support non-element participants?
  I assume YES. Several people said it's necessary, and there were no objection.
1. Should we support element-specific features such as participate-by-markup, ```<label>``` association, interactive form validation.
1. If the consensus for the above issue is YES, we need something like Proposal B and need to define the details.
   - ```customElement.define()``` and additional callbacks,
   - Hooks on ```ShadowRoot```,
   - introduce dedicated content attribute like [```participant=```](https://github.com/w3c/webcomponents/issues/187#issuecomment-369134463),
   - or something


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