<input type="text" form="myform" name="inp1" />
<form id="myform" name="myform">
    ...
</form>

(function($) {
  /**
   * polyfill for html5 form attr
   */

  // detect if browser supports this
  var sampleElement = $('[form]').get(0);
  var isIE11 = !(window.ActiveXObject) && "ActiveXObject" in window;
  if (sampleElement && window.HTMLFormElement && sampleElement.form instanceof HTMLFormElement && !isIE11) {
    // browser supports it, no need to fix
    return;
  }

  /**
   * Append a field to a form
   *
   */
  $.fn.appendField = function(data) {
    // for form only
    if (!this.is('form')) return;

    // wrap data
    if (!$.isArray(data) && data.name && data.value) {
      data = [data];
    }

    var $form = this;

    // attach new params
    $.each(data, function(i, item) {
      $('<input/>')
        .attr('type', 'hidden')
        .attr('name', item.name)
        .val(item.value).appendTo($form);
    });

    return $form;
  };

  /**
   * Find all input fields with form attribute point to jQuery object
   *
   */
  $('form[id]').submit(function(e) {
    // serialize data
    var data = $('[form='+ this.id + ']').serializeArray();
    // append data to form
    $(this).appendField(data);
  }).each(function() {
    var form = this,
      $fields = $('[form=' + this.id + ']');

    $fields.filter('button, input').filter('[type=reset],[type=submit]').click(function() {
      var type = this.type.toLowerCase();
      if (type === 'reset') {
        // reset form
        form.reset();
        // for elements outside form
        $fields.each(function() {
          this.value = this.defaultValue;
          this.checked = this.defaultChecked;
        }).filter('select').each(function() {
          $(this).find('option').each(function() {
            this.selected = this.defaultSelected;
          });
        });
      } else if (type.match(/^submit|image$/i)) {
        $(form).appendField({name: this.name, value: this.value}).submit();
      }
    });
  });


})(jQuery);

(function($) {
    /**
     * polyfill for html5 form attr
     */

    // detect if browser supports this
    var SAMPLE_FORM_NAME = "html-5-polyfill-test";
    var sampleForm = $("<form id='" + SAMPLE_FORM_NAME + "'/>");
    var sampleFormAndHiddenInput = sampleForm.add($("<input type='hidden' form='" + SAMPLE_FORM_NAME + "'/>"));
    sampleFormAndHiddenInput.prependTo('body');
    var sampleElementFound = sampleForm[0].elements[0];
    sampleFormAndHiddenInput.remove();
    if (sampleElementFound) {
        // browser supports it, no need to fix
        return;
    }

    /**
     * Append a field to a form
     *
     */
    $.fn.appendField = function(data) {
      // for form only
      if (!this.is('form')) return;

      // wrap data
      if (!$.isArray(data) && data.name && data.value) {
        data = [data];
      }

      var $form = this;

      // attach new params
      $.each(data, function(i, item) {
        $('<input/>')
          .attr('type', 'hidden')
          .attr('name', item.name)
          .val(item.value).appendTo($form);
      });

      return $form;
    };

    /**
     * Find all input fields with form attribute point to jQuery object
     *
     */
    $('form[id]').submit(function(e) {
      // serialize data
      var data = $('[form='+ this.id + ']').serializeArray();
      // append data to form
      $(this).appendField(data);
    }).each(function() {
      var form = this,
        $fields = $('[form=' + this.id + ']');

      $fields.filter('button, input').filter('[type=reset],[type=submit]').click(function() {
        var type = this.type.toLowerCase();
        if (type === 'reset') {
          // reset form
          form.reset();
          // for elements outside form
          $fields.each(function() {
            this.value = this.defaultValue;
            this.checked = this.defaultChecked;
          }).filter('select').each(function() {
            $(this).find('option').each(function() {
              this.selected = this.defaultSelected;
            });
          });
        } else if (type.match(/^submit|image$/i)) {
          $(form).appendField({name: this.name, value: this.value}).submit();
        }
      });
    });


  })(jQuery);

var isEdge = navigator.userAgent.indexOf("Edge");
      if (sampleElement && window.HTMLFormElement && sampleElement.form instanceof HTMLFormElement && !isIE11 && isEdge == -1) {
        // browser supports it, no need to fix
        return;
      }

(function($) {
/**
 * polyfill for html5 form attr
 */

// detect if browser supports this
var SAMPLE_FORM_NAME = "html-5-polyfill-test";
var sampleForm = $("<form id='" + SAMPLE_FORM_NAME + "'/>");
var sampleFormAndHiddenInput = sampleForm.add($("<input type='hidden' form='" + SAMPLE_FORM_NAME + "'/>"));
sampleFormAndHiddenInput.prependTo('body');
var sampleElementFound = sampleForm[0].elements[0];
sampleFormAndHiddenInput.remove();
if (sampleElementFound) {
    // browser supports it, no need to fix
    return;
}

/**
 * Append a field to a form
 *
 */
var CLASS_NAME_POLYFILL_MARKER = "html-5-polyfill-form-attr-marker";
$.fn.appendField = function(data) {
  // for form only
  if (!this.is('form')) return;

  // wrap data
  if (!$.isArray(data) && data.name && data.value) {
    data = [data];
  }

  var $form = this;

  // attach new params
  $.each(data, function(i, item) {
    $('<input/>')
      .attr('type', 'hidden')
      .attr('name', item.name)
      .attr('class', CLASS_NAME_POLYFILL_MARKER)
      .val(item.value).appendTo($form);
  });

  return $form;
};

/**
 * Find all input fields with form attribute point to jQuery object
 *
 */
$('form[id]').submit(function(e, origSubmit) {
  // clean up form from last submit
  $('.'+CLASS_NAME_POLYFILL_MARKER, this).remove();
  // serialize data
  var data = $('[form='+ this.id + ']').serializeArray();
  // add data from external submit, if needed:
  if (origSubmit && origSubmit.name)
    data.push({name: origSubmit.name, value: origSubmit.value})
  // append data to form
  $(this).appendField(data);
})

//submit and reset behaviour
$('button[type=reset], input[type=reset]').click(function() {
  //extend reset buttons to fields with matching form attribute
  // reset form
  var formId = $(this).attr("form");
  var formJq = $('#'+formId);
  if (formJq.length)
    formJq[0].reset();
  // for elements outside form
  if (!formId)
    formId = $(this).closest("form").attr("id");
  $fields = $('[form=' + formId + ']');
  $fields.each(function() {
    this.value = this.defaultValue;
    this.checked = this.defaultChecked;
  }).filter('select').each(function() {
    $(this).find('option').each(function() {
      this.selected = this.defaultSelected;
    });
  });
});
$('button[type=submit], input[type=submit], input[type=image]').click(function() {
  var formId = $(this).attr("form") || $(this).closest("form").attr("id");
  $('#'+formId).trigger('submit', this);  //send clicked submit as extra parameter
});