Semantic UI is a front-end framework that provides a wide range of UI components styled with a cohesive theming system. It uses a human-friendly, natural-language-inspired class naming convention for layouts, elements, and behaviors, enabling readable markup for buttons, forms, grids, menus, modals, dropdowns, and transitions. Theming is centralized through a theme system that enables consistent branding across an application, with tokens and customizable styles. The framework ships with CSS and JavaScript, supports responsive design, integrates with popular libraries and frameworks, and offers modular modules and plugins for extensibility.

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Semantic UI

CSS framework for theming, components, and responsive UI.

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