Object-OrientedCSS_html/css_WEB-ITnose

http://oocss.org/

2、reset.css

http://meyerweb.com/eric/tools/css/reset/

3、normalize.css

https://necolas.github.io/normalize.css/

4、neat.css

http://www.neatcss.com/

参考：

http://www.jikexueyuan.com/course/802_4.html?ss=1