cssnano

A modular CSS minifier built on top of PostCSS, version 3.7.3 (patch2). It uses small PostCSS plugins to perform advanced optimizations like custom identifier reduction, z-index rebasing, and adjacent selector merging. Released frequently alongside PostCSS updates. Differentiates from simpler minifiers (e.g., csso, clean-css) by leveraging the PostCSS ecosystem for extensibility and modularity.