plugin=diff is not implemented.
http://yellow.ribbon.to/~tuotehhou/index.php?%2BWindowPhone%2B%E3%83%91%E3%83%95%E3%82%A9%E3%83%BC%E3%83%9E%E3%83%B3%E3%82%B9%E3%81%AE%E5%90%91%E4%B8%8A
plugin=diff is not implemented.