HTMLFormElement: requestSubmit() method - Web APIs | MDN

Parameters submitter Optional A submit button that is a member of the form. If the submitter specifies form* attributes, they will override the form's submission behavior (e.g., formmethod="POST"). If the submitter has a name attribute or is an <input type="image">, its data will be included in the form submission (e.g., btnName=btnValue). If you omit the submitter parameter, the form element itse

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Form#submitと違って、patternでのvalidationをしてからsubmitする