mkdocs-material/src/partials/tabs-item.html

<!--
  Copyright (c) 2016-2023 Martin Donath <martin.donath@squidfunk.com>

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<!-- Determine class according to state -->
{% if not class %}
  {% set class = "md-tabs__link" %}
  {% if nav_item.active %}
    {% set class = class ~ " md-tabs__link--active" %}
  {% endif %}
{% endif %}

<!-- Main navigation item with nested items -->
{% if nav_item.children %}
  {% set title = title | d(nav_item.title) %}
  {% set nav_item = nav_item.children | first %}

  <!-- Recurse, if the first item has further nested items -->
  {% if nav_item.children %}
    {% include "partials/tabs-item.html" %}

  <!-- Render item -->
  {% else %}
    <li class="md-tabs__item">
      <a href="{{ nav_item.url | url }}" class="{{ class }}">
        {{ title }}
      </a>
    </li>
  {% endif %}

<!-- Main navigation item -->
{% else %}
  <li class="md-tabs__item">
    <a href="{{ nav_item.url | url }}" class="{{ class }}">
      {{ nav_item.title }}
    </a>
  </li>
{% endif %}