</paper-button>

    function submitForm() {
      document.getElementById('form').submit();
    }

To customize the request sent to the server, you can listen to the `iron-form-presubmit`
event, and modify the form's[`iron-ajax`](https://elements.polymer-project.org/elements/iron-ajax)
object. However, If you want to not use `iron-ajax` at all, you can cancel the
event and do your own custom submission:

  Example of modifying the request, but still using the build-in form submission:

    form.addEventLis