private function getChunksFromUnit(\DOMElement $unit): array
    {
        $chunks = explode('.', $unit->getAttribute('id'));

        // Handle keys with dots
        if (preg_match('/tl_layout\.[a-z]+\.css\./', $unit->getAttribute('id'))) {
            $chunks = [$chunks[0], $chunks[1].'.'.$chunks[2], $chunks[3]];
        }

        return $chunks;
    }