details.html.twig

{#
/**
 * @file
 * Theme override for a details element.
 *
 * Available variables
 * - attributes: A list of HTML attributes for the details element.
 * - errors: (optional) Any errors for this details element, may not be set.
 * - title: (optional) The title of the element, may not be set.
 * - summary_attributes: A list of HTML attributes for the summary element.
 * - description: (optional) The description of the element, may not be set.
 * - children: (optional) The children of the element, may not be set.
 * - value: (optional) The value of the element, may not be set.
 *
 * @see\Drupal\Core\Form\FormPreprocess::preprocessDetails()
 */
#}
<details{{ attributes }}>
  {%- if title -%}
    {%
      set summary_classes = [
        required ? 'js-form-required',
        required ? 'form-required',
      ]
    %}
    <summary{{ summary_attributes.addClass(summary_classes) }}>{{ title }}</summary>
  {%- endif -%}
  <div class="details-wrapper">
    {% if errors %}
      <div class="form-item--error-message form-item-errors">
        {{ errors }}
      </div>
    {% endif %}
    {%- if description -%}
      {% set description_attributes = create_attribute({id: attributes['aria-describedby']}) %}
      <div {{ description_attributes.addClass(['details-description']) }}>{{ description }}</div>
    {%- endif -%}
    {%- if children -%}
      {{ children }}
    {%- endif -%}
    {%- if value -%}
      {{ value }}
    {%- endif -%}
  </div>
</details>