<nav aria-label=“Secondary navigation”>

<ul class="usa-sidenav">
  {% for link in include.links %}
    {% assign _href = link.href %}
    {% assign _current = false %}
    {% if link.href == page.url or link.href == page.permalink %}
      {% assign _current = true %}
    {% endif %}
  <li class="usa-sidenav__item">
    <a href="{% if link.external == true %}{{ link.href }}{% else %}{{ link.href | relative_url }}{% endif %}"
       {% if _current %} class="usa-current" {% endif %}
       {% if link.class %}class="{{ link.class }}" {% endif %} >
       {{ link.text }}
    </a>
    {% if _current and page.subnav %}
    <ul class="usa-sidenav__sublist">
      {% include subnav.html links=page.subnav %}
    </ul>
    {% endif %}
  </li>
  {% endfor %}
</ul>

</nav>