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On . By CodimTh
Category:

Code snippet that can be used to add a specific css class to webforms/forms form tag in Drupal 8.

/**
 * @param $form
 * @param $form_state
 * @param $form_id
 */
function mymodule_form_alter(&$form, &$form_state, $form_id)
{
  if ($form_id == 'webform_submission_contact_add_form') {
    // add class to tag <form> 
    $form['#attributes']['class'][] = 'my-custom-class';
  }
}

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