- CSS minifier with structural optimizations https://css.github.io/csso/csso.html
- Orginal repo: https://github.com/css/csso
CSSO (CSS Optimizer) is a CSS minifier. It performs three sort of transformations: cleaning (removing redundant), compression (replacement for shorter form) and restructuring (merge of declarations, rulesets and so on). As a result your CSS becomes much smaller.