<%- if klass.type == ‘class’ && (ancestors = klass.super_classes).any? %> <div id=“parent-class-section” class=“nav-section”>

<details class="nav-section-collapsible" open>
  <summary class="nav-section-header">
    <span class="nav-section-icon">
      <svg><use href="#icon-ancestors"></use></svg>
    </span>
    <span class="nav-section-title">Ancestors</span>
    <span class="nav-section-chevron">
      <svg><use href="#icon-chevron"></use></svg>
    </span>
  </summary>
  <%= generate_ancestor_list(ancestors, klass) %>
</details>

</div> <%- end %>