protected function getErrorLevelForAdditionalHtml($html)
	{
		if (preg_match('#^<(i|b|ul|ol|li|h3)( style="[a-zA-Z0-9_\:\ \;\-]+")?>$#', $html))
		{
			return Output::ERROR;
		}

		if (in_array($html, array(
			'<em>',
			'<strong>',
			'<samp>',
			'<u>',
			'<br />',
			'<br>',
			'<hr>'
		)))
		{
			return Output::NOTICE;
		}

		if (preg_match('#^<a href="([a-zA-Z0-9_\:\&\/\?\.\-\#\@]+)">$#', $html) ||
			preg_match('#^<a href="([a-zA-Z0-9_\:\&\/\?\.\-\#]+)" rel="external">$#', $html))
		{
			return Output::ERROR;
		}

		return Output::FATAL;
	}