{# Breadcrumb <li> items (rendered inside page.html's <ol class="breadcrumb">). #}
{% for crumb in crumbs %}
  {% if crumb.active %}
    <li class="breadcrumb-item active" aria-current="page">{{ crumb.label }}</li>
  {% else %}
    <li class="breadcrumb-item"><a href="{{ crumb.url }}">{{ crumb.label }}</a></li>
  {% endif %}
{% endfor %}