Base UI is a headless component library and unstyled framework providing accessible interface primitives. It decouples behavioral logic and state management from the visual layer, allowing developers to implement complex UI patterns while maintaining total control over the final styling.
The library implements WAI-ARIA design patterns to ensure all primitives support standard keyboard navigation and screen reader accessibility. It provides a suite of low-level building blocks that handle the internal mechanics of interface elements without bundling any CSS.
The framework covers a broad range of capabilities, including interactive popup management for modals and tooltips, complex form implementation with integrated validation and error handling, and high-performance list rendering. It also includes specialized components for navigation, such as tabbed interfaces, nested menus, and coordinated drawers.
