templates/components/summary.html
<dl class="govuk-summary-list {% for class in component.classes %}{{ class }} {% endfor %}">
{% for key, value in component.values.items %}
<div class="govuk-summary-list__row">
<dt class="govuk-summary-list__key">
{{ key }}
</dt>
<dd class="govuk-summary-list__value">
<span data-max-length="300">{{ value|markdown }}</span>
</dd>
</div>
{% endfor %}
</dl>