code: protected function compile()
  	{
  		$this->text = StringUtil::toHtml5($this->text);
  
  		// Add the static files URL to images
  		if ($staticUrl = System::getContainer()->get('contao.assets.files_context')->getStaticUrl())
  		{
  			$path = Config::get('uploadPath') . '/';
  			$this->text = str_replace(' src="' . $path, ' src="' . $staticUrl . $path, $this->text);
  		}
  
  		$this->Template->text = StringUtil::encodeEmail($this->text);
  		$this->Template->addImage = false;
  
  		// Add an image
  		if ($this->addImage && $this->singleSRC != '')
  		{
  			$objModel = FilesModel::findByUuid($this->singleSRC);
  
  			if ($objModel !== null && is_file(System::getContainer()->getParameter('kernel.project_dir') . '/' . $objModel->path))
  			{
  				$this->singleSRC = $objModel->path;
  				$this->addImageToTemplate($this->Template, $this->arrData, null, null, $objModel);
  			}
  		}
  	}
docs: Generate the content element