[w3c/webcomponents] Custom Elements as submittable elements (#646)

The HTML spec currently defines [submittable elements](https://html.spec.whatwg.org/#category-submit) as the set list of elements that can be used in a form to submit data. That list being `<button>`, `<input>`, `<output>`, `<select>`, and `<textarea>`.

Is there currently any way to make a Custom Element could add itself to this list?

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