Ensure CSS selectors are unique.

Use Custom Selectors in CSS

Selector parser with built in methods for working with selector strings.

Safe defaults for cssnano which require minimal configuration.

PostCSS plugin to transform :not() W3C CSS level 4 pseudo class to :not() CSS level 3 selectors

Minify selectors with PostCSS.

Resolve a nested selector in a PostCSS AST

Merge CSS rules with PostCSS.

Advanced optimisations for cssnano; may or may not break your CSS!

Use the :focus-within pseudo-selector in CSS

Use the :focus-visible pseudo-selector in CSS

Use the :any-link pseudo-class in CSS

Style form elements when they are empty

Use the :dir pseudo-class in CSS

Determine selector specificity with postcss-selector-parser

PostCSS plugin to unwrap nested rules like how Sass does it

Style elements relative to other elements in CSS

The Reference Element Pseudo-class: :scope

automatically keep css selectors unique

Discard duplicate rules in your CSS files with PostCSS.