adaptivetheme-8.x-3.x-dev/at_core/templates/layout/row--header.html.twig

{#
/**
 * @file
 * Row template suggestion to display the header row.
 *
 * Available variables:
 * - row_name: the name of the row.
 * - regions: contains regions data to appear in this row.
 * - row_attributes: HTML attributes for the row outer wrapper
 * - wrapper_attributes: HTML attributes for the row inner wrapper.
 * - container_attributes: HTML attributes for the row container.
 * - row_prefix: insert content/markup etc before the row.
 * - row_suffix: insert content/markup etc after the row.
 *
 * @see at_core_preprocess_row()
 */
#}
<div{{ row_attributes }}>
  {{ row_prefix }}
  <header{{ wrapper_attributes }}>
    <div{{ container_attributes }}>
      {{ regions }}
    </div>
  </header>
  {{ row_suffix }}
</div>