protected function cssEscaper(array $matches): string
	{
		$chr = $matches[0];

		if(strlen($chr) === 1)
		{
			$ord = ord($chr);
		}
		else
		{
			$chr = mb_convert_encoding($chr, 'UTF-16BE', 'UTF-8');

			$ord = hexdec(bin2hex($chr));
		}

		return sprintf('\\%X ', $ord);
	}