Use the color-mix function in CSS
Use the relative color syntax in CSS
Use double-position gradients in CSS
Use pow(), sqrt(), hypot(), log(), exp() exponential functions in CSS
Convert values with PostCSS (e.g. ms -> s)
Use the parts of normalize.css or sanitize.css you need from your browserslist
PostCSS plugin to fallback initial keyword.
Include files in HTML
PostCSS syntax for parsing HTML (and HTML-like)
Use number values in aspect-ratio media queries.
Templates extending (Jade-like)
Use vb and vi length units in CSS
Use logical values in the resize property
Optimise inline SVG with PostCSS.
The Reference Element Pseudo-class: :scope
A BBCode to AST Parser part of @bbob
PostCSS plugin to keep rules and at-rules content in order.
Use logical overscroll behavior properties and values in CSS
Use postcss with esbuild
Transforms css values and at-rule params into the tree
Use Custom Media Queries in CSS
Use logical overflow properties and values in CSS
Indent-based CSS syntax for PostCSS
Determine selector specificity with postcss-selector-parser