css优化器-csso

CSSO (CSS Optimizer) is a CSS minimizer unlike others. In addition to usual minification techniques it can perform structural optimization of CSS files, resulting in smaller file size compared to other minifiers.
See detailed information on bem.info/tools/optimizers/csso.

中文

CSSO (CSS 优化器) 是一个与众不同的CSS代码压缩器。相比其他压缩器，除了常用的压缩技术外，它还会通过重建CSS代码结构信息的优化技术从而使文件压缩到更小的尺寸。
http://bem.info/tools/optimizers/csso/

from https://github.com/css/csso