CSSO CSS 优化工具

CSSO (CSS Optimizer) 是一个 CSS 最小化压缩工具，不仅对 CSS 做压缩还对 CSS 进行结构分析，生成更小的文件。

安全转换：

Removal of whitespace

Removal of trailing ;

Removal of comments

Removal of invalid @charset и @import declarations

Minification of color properties

Minification of 0

Minification of multi-line strings

Minification of the font-weight property

结构优化：

Merging blocks with identical selectors

Merging blocks with identical properties

Removal of overridden properties

Removal of overridden shorthand properties

Removal of repeating selectors

Partial merging of blocks

Partial splitting of blocks

Removal of empty ruleset and at-rule

Minification of margin and padding properties