public static function audio($src = '', $attr = false)
	{
		if(static::$html5)
		{
			if(is_array($src))
			{
				$source = '';
				foreach($src as $item)
				{
					$source .= html_tag('source', array('src' => $item));
				}
			}
			else
			{
				$source = html_tag('source', array('src' => $src));
			}
			return html_tag('audio', $attr, $source);
		}
	}