A best-practices CSS foundation
Generate fallback values for content with alt text
The Reference Element Pseudo-class: :scope
Utilities for PostCSS plugins
Use number values in aspect-ratio media queries.
Use the alpha() function in CSS
Use the random function in CSS
Use the `system-ui` keyword
A stylelint rule to disallow usage of unknown custom properties
Gamut map css colors to fit display specific gamuts
Use mixins in CSS
Declare a list of custom properties in a single at-property rule
Use the syntax production in syntax descriptors
A tool set for CSS: fast detailed parser (CSS → AST), walker (AST traversal), generator (AST → CSS) and lexer (validation and matching) based on specs and browser implementations
PostCSS plugin to transform :not() W3C CSS level 4 pseudo class to :not() CSS level 3 selectors
Use the :focus-within pseudo-selector in CSS
Style form elements when they are empty
Use the :dir pseudo-class in CSS
Use sign and abs functions in CSS
Use Sass as a PostCSS plugin
Use the overflow shorthand in CSS
Use the rebeccapurple color keyword in CSS
Use the font-width property in CSS
Modify colors using the color-mod() function in CSS