Features

a non-exhaustive list of features is provided below:

no dependency
CSS validation based upon mdn-data
CSS modules support
fault-tolerant parser implementing the CSS syntax module 3 recommendations.
fast and efficient minification without unsafe transforms, see benchmark
colors minification: color(), lab(), lch(), oklab(), oklch(), color-mix(), light-dark(), system colors and relative color
color conversion to any supported color format
automatic nested css rules generation
nested css rules conversion to legacy syntax
sourcemap generation
css shorthands computation. see the supported properties list below
css transform functions minification
css math functions evaluation: calc(), clamp(), min(), max(), etc.
css variables inlining
duplicate properties removal
@import rules flattening
experimental CSS prefix removal