http://tool.lu/js/

http://tool.oschina.net/codeformat/js/

https://validator.w3.org/

http://tool.oschina.net/jscompress

http://fontawesome.io/icons/

http://www.code-cn.com/

http://jigsaw.w3.org/css-validator/

http://www.w3school.com.cn/index.html