opensearch-docs-cn/_includes/nav_item.html

<li>
  {% if url_full == include.url_full %} {{ include.text }} {% else %}
    <a href="{{ include.href }}" {% if url_parts[1] == {{include.url_fragment}} %} class="in-category" {% endif %}>
      {{ include.text }}
    </a>
  {% endif %}
</li>