Use env() variables in CSS
Strip redundant indentation and indent the string
Correctly declare progressive enhancements for CSS Custom Properties.
Keep only the CSS you need based on comments and your browserslist
Ensure values are ordered consistently in your CSS.
Use oklab() and oklch() color functions in CSS
Use the range notation in CSS media queries
PostCSS plugin to fallback initial keyword.
Use flow-relative (inline-start and inline-end) values for float and clear
PostCSS helpers to throw or output GNU style messages
Use the color-mix function in CSS
Use the relative color syntax in CSS
PostCSS plugin to transform rgba() to hexadecimal
Use pow(), sqrt(), hypot(), log(), exp() exponential functions in CSS
Use double-position gradients in CSS
PostCSS plugin to fallback initial keyword.
Convert values with PostCSS (e.g. ms -> s)
Normalize, canonicalize, and format BCP 47 tags
PostCSS plugin to transform W3C CSS color function to more compatible CSS.
PostCSS plugin to transform W3C CSS hwb() color to more compatible CSS (rgb() (or rgba()))
Use number values in aspect-ratio media queries.
PostCSS syntax for parsing HTML (and HTML-like)
Use logical values in the resize property
Optimise inline SVG with PostCSS.