code: public function render()
      {
          /* @var \Cawa\Renderer\PhtmlHtmlContainer $clone */
          $deepcopy = new DeepCopy();
          $clone = $deepcopy->copy($this);
  
          $content = $clone->content ?: $clone->containerRender();
          $clone->addViewData('content', $content);
          $clone->content = $clone->phtmlRender();
  
          $clone->clear();
  
          return $clone->renderClone();
      }
docs: {@inheritdoc}