materio-base-d7/modules/filter/filter.js

(function ($) {

/**
 * Automatically display the guidelines of the selected text format.
 */
Drupal.behaviors.filterGuidelines = {
  attach: function (context) {
    $('.filter-guidelines', context).once('filter-guidelines')
      .find(':header').hide()
      .closest('.filter-wrapper').find('select.filter-list')
      .bind('change', function () {
        $(this).closest('.filter-wrapper')
          .find('.filter-guidelines-item').hide()
          .siblings('.filter-guidelines-' + this.value).show();
      })
      .change();
  }
};

})(jQuery);