core-bundle/src/Resources/contao/forms/FormExplanation.php
public function generate()
	{
		$this->text = StringUtil::toHtml5($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);
		}

		return StringUtil::encodeEmail($this->text);
	}
public function generate()
	{
		$this->text = StringUtil::toHtml5($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);
		}

		return StringUtil::encodeEmail($this->text);
	}
Generate the widget and return it as string

@return string The widget markup