UnoCSS

UnoCSS is a flexible and high-performance atomic CSS engine that operates without predefined core utilities, leaving all functionalities to be provided entirely through configurable presets. Designed to eliminate parsing and abstract syntax tree generation overhead, it operates directly on source code to deliver rapid compilation. It features zero dependencies, built-in support for shortcuts, attributify mode, icon integration, and multiple framework build tools including Vite, Webpack, and Rollup.