mkdocs-material/material/partials/tabs.html

<nav class="md-tabs {% if page.ancestors | length > 0 %} md-tabs--active {% endif %}" data-md-component="tabs">
  <div class="md-tabs__inner md-grid">
    <ul class="md-tabs__list">
      {% for nav_item in nav %}
        {% include "partials/tabs-item.html" %}
      {% endfor %}
    </ul>
  </div>
</nav>