Pure (or Pure.css) is a set of small, responsive CSS modules created by Yahoo that provides a minimal, mobile-friendly foundation for web projects.

The main features and capabilities of Pure include:

• Extremely Minimal Footprint: Clocks in at a total of 3.5KB minified and gzipped, with individual modular downloads for Base (0.9KB), Grids (0.5KB), Forms (1.4KB), Buttons (0.7KB), Tables (0.4KB), and Menus (0.7KB).

• Solid CSS Foundation: Builds on Normalize.css to deliver consistent layout rules and styling for native HTML elements as well as standard UI components.

• Mobile-First & Responsive Layouts: Designed with mobile devices in mind, providing responsive Grids and Menus that adapt cleanly to all screen sizes out of the box.

• Unopinionated & Minimal Design: Features a flat, minimal design that stays out of your way, making it far easier to build custom application styles on top without having to override heavy framework styles.

• Extensible & Customizable: Allows developers to easily customize themes or extend components to match the specific look and feel of their web project.

• Open-Source & Lightweight: Distributed open-source under the Yahoo BSD License for flexible use across web applications.