{% if include.open == true %}
  {% assign open="open" %}
{% else %}
  {% assign open=null %}
{% endif %}

<section class="accordion">
  <details class="accordion__details" data-label="content-accordion-{{ include.summary | slugify }}" aria-expanded="{{ include.open | false }}" {{ open }}>
    <summary class="accordion__summary">{{ include.summary }}</summary>
    <div class="accordion__content">{{ include.content }}</div>
  </details>
</section>