Research editor grouped list

<ul class="list list--bordered">
  <li>
    <div class="list__item">
      ...
    </div>
    <ul class="list list--grouped" id="grouped-child-0" data-toggle-expand="" aria-expanded="false">
      <li class="list__item">
        ...
      </li>
      ...
    </ul>
  </li>
  ...
</ul>