Ensure values are ordered consistently in your CSS.
Keep only the CSS you need based on comments and your browserslist
Use the range notation in CSS media queries
Use oklab() and oklch() color functions in CSS
PostCSS plugin to fallback initial keyword.
PostCSS helpers to throw or output GNU style messages
Use flow-relative (inline-start and inline-end) values for float and clear
PostCSS plugin to transform rgba() to hexadecimal
PostCSS plugin to fallback initial keyword.
Use the color-mix function in CSS
Use the relative color syntax in CSS
Use double-position gradients in CSS
Convert values with PostCSS (e.g. ms -> s)
Use pow(), sqrt(), hypot(), log(), exp() exponential functions in CSS
PostCSS plugin to transform W3C CSS color function to more compatible CSS.
Use the parts of normalize.css or sanitize.css you need from your browserslist
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 vb and vi length units in CSS
Optimise inline SVG with PostCSS.
Use logical values in the resize property
The Reference Element Pseudo-class: :scope
A CSS Modules transform to extract local aliases for inline imports