This is all work I did when I was thinking we were going to use the gravity forms awful markup

gravity_forms_ugh.php

/**
 * Filters the next, previous and submit buttons.
 * Replaces the forms <input> buttons with <button> while maintaining attributes from original <input>.
 *
 * @param string $button Contains the <input> tag to be filtered.
 * @param object $form Contains all the properties of the current form.
 *
 * @return string The filtered button.
 */
add_filter( 'gform_next_button', 'input_to_button', 10, 2 );
add_filter( 'gform_previous_button', 'input_to_button', 10, 2 );
add_filter( 'gform_submit_button', 'input_to_button', 10, 2 );
function input_to_button( $button, $form ) {
    $dom = new DOMDocument();
    $dom->loadHTML( $button );
    $input = $dom->getElementsByTagName( 'input' )->item(0);
    $new_button = $dom->createElement( 'button' );
    $new_button->appendChild( $dom->createTextNode( $input->getAttribute( 'value' ) ) );
    $input->removeAttribute( 'value' );
    foreach( $input->attributes as $attribute ) {
      if ($attribute->name == 'class') {
        $attribute->value .= ' secondary all-caps';
      }
        $new_button->setAttribute( $attribute->name, $attribute->value );
    }
    $input->parentNode->replaceChild( $new_button, $input );
    return $dom->saveHtml( $new_button );
}

// Adds foundation data validation to gravity form with id 5
add_filter( 'gform_form_tag', 'form_tag', 10, 2 );
function form_tag($form_tag, $form) {
    if ( $form['id'] != 5 ) {
        //not the form whose tag you want to change, return the unchanged tag
        return $form_tag;
    }
    $form_tag = preg_replace( "|method=|", "data-abide novalidate method=", $form_tag );
    return $form_tag;
}

// Adds the ability to hide individual labels
add_filter( 'gform_enable_field_label_visibility_settings', '__return_true' );

add_filter( 'gform_tooltips', 'add_pattern_tooltip' );
function add_pattern_tooltip( $tooltips ) {
  $tooltips['form_patterns_picker'] = sprintf(
    '<h6>%s</h6>%s <a href="%s">Link</a>',
    __( 'Patterns', 'gravityforms' ),
    __( 'Do not use with input masks. I did not test for the use case. Read more about usage here: ', 'gravityforms' ),
    __( 'http://foundation.zurb.com/sites/docs/abide.html#builtin-patterns-and-validators', 'gravityforms' )
  );
  return $tooltips;
}

add_action( 'gform_field_standard_settings', 'additional_field_settings', 10, 2 );
function additional_field_settings($position, $form_id) {
  //create settings on position 25 (right after Field Label)
  if ($position == 25) {
    $patterns = array(
      'none' => '-',
      'alpha' => 'alpha',
      'alpha_numeric' => 'alpha_numeric',
      'date' => 'date',
      'domain' => 'domain',
      'email' => 'email',
      'integer' => 'integer',
      'number' => 'number',
      'url' => 'url'
    );
    ?>
    <li class="pattern_setting field_setting">
      <label for="field_admin_label" class="section_label">
        <?php esc_html_e('Pattern', 'gravityforms'); ?>
        <?php gform_tooltip( 'form_patterns_picker' ); ?>
      </label>
      <select id="patterns_picker" onchange="SetFieldProperty('patternField', this.value);">
        <?php foreach ($patterns as $key => $value) { ?>
          <option value="<?php echo $key;?>"> <?php echo $value; ?> </option>
        <?php  }  ?>
      </select>
    </li>
    <?php
  }
}

add_action( 'gform_editor_js', 'editor_script' );
function editor_script(){
    ?>
    <script type='text/javascript'>
      //adding setting to fields of type "text" and "email"
      fieldSettings.text += ', .pattern_setting';
      fieldSettings.email += ', .pattern_setting';

      //binding to the load field settings event to initialize the checkbox
      jQuery(document).bind('gform_load_field_settings', function(event, field, form){
        jQuery('#patterns_picker').val(field.patternField || '');
      });
    </script>
    <?php
}

/**
 * Inject pattern attributes into individual fields of type email or text
 * Also adds span class="form-error" for abide form validation
 * adds aria-label to input if label is marked as hidden
 *
 * @param string $markup The markup for an individual field.
 * @param GF_Field $field The Gravity Forms Field object.
 */

add_filter( 'gform_field_content', 'add_pattern_attribute', 10, 2 );
function add_pattern_attribute($markup, $field) {
  if (!isset($field->patternField) || !$field->patternField || $field->patternField == 'none') {
    return $markup;
  }

  if ($field->type == 'email' || $field->type == 'text' && isset($field->patternField)) {
    // Find the first input element.
    $regex = '/\<(?:input)\s+[^\>]+?(\s*\/?\>){1}/im';

    if (!preg_match( $regex, $markup, $input ) ) {
      return $markup;
    }

    $pattern = sprintf(' pattern="%s"', esc_attr( $field->patternField ) );
    $element = str_replace( $input[1], $pattern . $input[1], $input[0] );

    return str_replace( $input[0], $element, $markup );
  }
}
/**
 * Adds span class="form-error" for abide form validation
 * if input has a defined error message
 * and adds aria-label to input if label is marked as hidden
 *
 * @param string $markup The markup for an individual field.
 * @param GF_Field $field The Gravity Forms Field object.
 */

add_filter( 'gform_field_content', 'add_form_error', 10, 2 );
function add_form_error($markup, $field) {
  if (!isset($field->errorMessage)) {
    return $markup;
  }
  else {
    // Find the first input element.
    $regex = '/\<(?:input)\s+[^\>]+?(\s*\/?\>){1}/im';

    if (!preg_match( $regex, $markup, $input ) ) {
      return $markup;
    }

    $element = $input[0];
    $element .= '<span class="form-error">' . $field->errorMessage . '</span>';


    // Adds aria-label attribute to input if hidden label is selected
    // Assumes there's a placeholder value
    if ($field->labelPlacement == 'hidden_label') {
      $element = preg_replace("|placeholder|", "aria-label='" . esc_attr($field->label) . "' placeholder", $element);
    }

    return str_replace( $input[0], $element, $markup );
  }
}