https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement/submit_event
HTMLFormElement: submit event - Web APIs | MDN
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https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement/reportValidity
HTMLFormElement: reportValidity() method - Web APIs | MDN
The reportValidity() method of the HTMLFormElement interface performs the same validity checking steps as the checkValidity() method. In addition, for each...
web apishtmlformelementmethodmdn