(And Why Is It So Scary? ... HTML - Form Submission - Action. You can perform submit action by, submit button, by clicking on hyperlink, button and image tag etc. onsubmit event is the event that occurs when the submit button is clicked. The difference is that The downsides of using this approach are the same as above with an addition that it's HTML5-specific so support for old browsers might be poor. The form-handler is specified in the form's action attribute. The HTML Submit button is used to submit form data to the script mentioned in the ACTION attribute. Submit: The HTML form tag has data inside it. This attribute on a