Case statement for collection template to build accessible breadcrumbs - https://www.shopify.com/partners/blog/breadcrumb-navigation

accessible-breadcrumbs-case-collection.liquid

  {% when 'collection' and collection.handle %}

    {% if current_tags %}
      <li>{{ collection.title | link_to: collection.url }}</li>
      <li>
        {% capture tag_url %}{{ collection.url }}/{{ current_tags | join: "+"}}{% endcapture %}
        <a href="{{ tag_url }}" aria-current="page">{{ current_tags | join: " + "}}</a>
      </li>
    {% else %}
      <li>
        <a href="{{ collection.url }}" aria-current="page">{{ collection.title }}</a>
      </li>
    {% endif %}