<div id=“classindex-section” class=“nav-section”>

<details class="nav-section-collapsible" open>
  <summary class="nav-section-header">
    <span class="nav-section-icon">
      <svg><use href="#icon-layers"></use></svg>
    </span>
    <span class="nav-section-title">Classes and Modules</span>
    <span class="nav-section-chevron">
      <svg><use href="#icon-chevron"></use></svg>
    </span>
  </summary>

  <%= generate_class_index_content(@classes, rel_prefix) %>
</details>

</div>