$ show sindresorhus/css-extras
CSS Extras is a library of CSS custom functions that leverages the new CSS @function rule to provide advanced styling capabilities. It includes 43+ functions for mathematical operations, color manipulation, typography, layout, spacing, animation, grid systems, filtering, theming, and utility operations. The library uses modern CSS features like color-mix, OKLab/OKLCH color spaces, and CSS logical properties to create sophisticated, theme-aware, and responsive design helpers. It comes with comprehensive documentation, testing utilities, and practical examples.
The LLM identified 2 files worth highlighting for reuse:
Parses CSS files to extract @function definitions and their JSDoc-style comments, then generates comprehensive markdown documentation. Demonstrates skill in CSS parsing with regex, comment extraction, and structured documentation generation. Could be reused for documenting other CSS custom function libraries with minimal modification.
Automated testing framework for CSS functions using Puppeteer. Creates test HTML, evaluates computed styles against expected values, and reports results. Shows expertise in browser-based CSS validation and could be adapted for testing other CSS libraries or design systems.