Facebook-Prophet/docs/_includes/nav/collection_nav_group.html

<div class="navGroup{% if currentgroup == group %} navGroupActive navGroupCurrent{% endif %}">
  <h3><i>+</i><span>{{ grouptitle }}</span></h3>
  <ul>
    {% if include.data_collection %}
      {% for item in group.items %}
        {% for collectionitem in include.data_collection %}
        {% if collectionitem.docid == item.id %}
          {% assign groupitem = collectionitem %}
          {% include nav/collection_nav_group_item.html %}
        {% endif %}
        {% endfor %}
      {% endfor %}
    {% else %}
      {% for groupitem in groupitems %}
      {% include nav/collection_nav_group_item.html %}
      {% endfor %}
    {% endif %}
  </ul>
</div>