code: public function getCell()
      {
          $widgetCell = $this->singleWidget;
          if ($widgetCell) {
              $widgetCell->prepend(Html::tag('div', '', ['id' => 'section-' . $this->systemId, 'class' => 'scroll-mark']));
  
              return $widgetCell;
          }
  
          return false;
      }
docs: Get cell.
  
  @return [[@doctodo return_type:getCell]] [[@doctodo return_description:getCell]]