templates/section/breadcrumbs.twig
<div {% if id %}id="{{ id|escape('html_attr') }}"{% endif %} class="breadcrumbs-container {{ classes|join(' ')|html_attribute }}" data-request-uri="{{ requestURI|escape('html_attr') }}" {{ data|writedata|raw }}>
<nav class='breadcrumbs' role='navigation'>
<ul>
{% for writable in writables %}
<li>{{ writable|write|raw }}</li>
{% endfor %}
</ul>
</nav>
</div>