core-bundle/src/Resources/contao/elements/ContentCode.php
public function generate()
	{
		if (TL_MODE == 'BE')
		{
			$return = '<pre>'. htmlspecialchars($this->code) .'</pre>';

			if ($this->headline != '')
			{
				$return = '<'. $this->hl .'>'. $this->headline .'</'. $this->hl .'>'. $return;
			}

			return $return;
		}

		return parent::generate();
	}
public function generate()
	{
		if (TL_MODE == 'BE')
		{
			$return = '<pre>'. htmlspecialchars($this->code) .'</pre>';

			if ($this->headline != '')
			{
				$return = '<'. $this->hl .'>'. $this->headline .'</'. $this->hl .'>'. $return;
			}

			return $return;
		}

		return parent::generate();
	}
Show the raw code in the back end

@return string