{#
/**
 * @file
 * Theme override for an 'input' #type form element.
 *
 * Available variables:
 * - attributes: A list of HTML attributes for the input element.
 * - children: Optional additional rendered elements.
 *
 * @see \Drupal\Core\Form\FormPreprocess::preprocessInput()
 */
#}
<button{{ attributes }}>attributes.value</button>{{ children }}