anchor.diff:          <div class="span4">
             Document type<br>
             <select id="document_type" name="document_type" disabled>
  -            <option value=""></option>
  +            <option value="" disabled selected>Select your option</option>
             </select>
           </div>
         </div>
  
positive.code:         <div class="span5">
            Event type<br>
            <select id="event_type" name="event_type">
            <%= options_for_select([
              ['', ''],
              ['Cites Animal Committee', 'cites_acs'],
              ['Cites Plant Committee', 'cites_pcs'],
              ['Cites Technical Committee', 'cites_tcs'],
  
negative.code:     if (event_type) {
        $event.attr('disabled', false);
        $.getJSON(event_type+'.json', function( data ) {
          var items = ['<option value="" disabled selected>Select your option</option>'];
          $.each(data, function( idx, obj ) {
            items.push(
              "<option value='" + obj.value + "'>" + obj.text + "</option>");
  