/**
Only work if your form has a submit button
*/
if ( ! HTMLFormElement.prototype.reportValidity) {

  HTMLFormElement.prototype.reportValidity = function () {

    var validity = this.checkValidity();

    if ( ! validity) {
      var submitButtons = this.querySelectorAll("button, input[type=submit]");

      for (var i = 0; i < submitButtons.length; i++) {
        if (submitButtons[i].type === "submit") {
          submitButtons[i].click();
          return validity;
        }
      }
    }

    return validity;
  }
}