protected function get_label() {
    return $this->markup(
      [
        'open'    => '<label %s>',
        'close'   => '</label>',
        'content' => $this->strings['label'],
        'context' => 'search-form-label',
        'params'  => [
          'input_id' => $this->get_input_id(),
        ],
      ]
    );
  }