Convert modern CSS into something browsers understand
Fault-tolerant CSS parser for PostCSS
PostCSS plugin to reduce calc()
Normalize multiple value display syntaxes into single values.
npm query parser and tools
Normalize unicode-range descriptors, and can convert to wildcard ranges.
Discard empty rules and values with PostCSS.
Convert two value syntax for repeat-style into one value.
Share target browsers between different front-end tools, like Autoprefixer, Stylelint and babel-env-preset
Minify at-rule params with PostCSS
Normalize CSS animation/transition timing functions.
Use the :focus-visible pseudo-selector in CSS
Trim whitespace inside and around CSS rules & declarations.
Reduce transform functions with PostCSS.
Normalize keyword values for position into length values.
PostCSS plugin to transform percentage-based opacity values to more compatible floating-point values.
Nest rules inside each other in CSS
Normalize URLs with PostCSS
Use the :focus-within pseudo-selector in CSS
Merge longhand properties into shorthand with PostCSS.
Ensure CSS selectors are unique.
SCSS parser for PostCSS
Use the :any-link pseudo-class in CSS
Use unquoted format on @font-face CSS definitions.