Convert modern CSS into something browsers understand

Lit support for PostCSS and related tooling

PostCSS plugin to transform W3C CSS Color Module Level 4 hsl() new syntax to more compatible CSS (comma-separated hsl() or hsla())

PostCSS plugin to transform W3C CSS Color Module Level 4 rgb() new syntax to more compatible CSS (comma-separated rgb() or rgba())

Fault-tolerant CSS parser for PostCSS

A PostCSS plugin that is used to wrap css styles with a css selector to constrain their affect on parent elements in a page.

Normalize multiple value display syntaxes into single values.

Normalize keyword values for position into length values.

Share target browsers between different front-end tools, like Autoprefixer, Stylelint and babel-env-preset

Convert two value syntax for repeat-style into one value.

Normalize unicode-range descriptors, and can convert to wildcard ranges.

Reduce transform functions with PostCSS.

Normalize CSS animation/transition timing functions.

Use two values display syntax for inner and outer display types.

Trim whitespace inside and around CSS rules & declarations.

Use the :focus-visible pseudo-selector in CSS

SCSS parser for PostCSS

Normalize URLs with PostCSS

ICSS utils for postcss ast

Use a place-* shorthand for align-* and justify-* in CSS