uswds-8.x-2.1-rc1/templates/system/menu/menu--secondary_menu.html.twig

{#
/**
 * @file
 * Override of system/menu.html.twig for the secondary menu.
 */
#}

{% set classes = [] %}

{% if items %}
<ul class="usa-nav__secondary-links">
{% for item in items %}
  <li class="usa-nav__secondary-item">
    
    {% if item.in_active_trail %}
      {% set classes = classes|merge(['usa-current']) %}
    {% else %}
      {% set classes = [] %}
    {% endif %}
    
    {{ link(item.title, item.url, create_attribute({'class': classes})) }}
  </li>
{% endfor %}
</ul>
{% endif %}