[1] Add form.requestSubmit() (domenic著, ) https://github.com/whatwg/html/commit/e0742f8fdf3b119fdabdcad01d2ebfef1d7a2262
[2] Proposal: allow a mode of form.submit() that behaves like clicking a submit button · Issue #4187 · whatwg/html () https://github.com/whatwg/html/issues/4187
[3] Add form.requestSubmit() by domenic · Pull Request #4597 · whatwg/html () https://github.com/whatwg/html/pull/4597
[4] Introduce SubmitEvent for the form 'submit' event (tkent-google著, ) https://github.com/whatwg/html/commit/f476180797e6124074b3cfeaf1973ea39eb6c499
[5] Would be nice if submit events exposed the "submitter" element · Issue #3195 · whatwg/html () https://github.com/whatwg/html/issues/3195
[6] Forms: Introduce SubmitEvent for 'submit' event by tkent-google · Pull Request #4984 · whatwg/html () https://github.com/whatwg/html/pull/4984