Skeleton is a lightweight responsive CSS boilerplate and mobile-first framework. It provides a foundation for building mobile-friendly websites through a fluid 12-column grid system, a minimal CSS reset library to normalize browser defaults, and default styling for raw HTML elements.
The project emphasizes a mobile-first development approach, using percentage-based widths and predefined media queries to progressively enhance layouts for larger screens. It includes a utility-first library of single-purpose classes to manage common layout tasks such as floating elements, clearing, and width constraints.
The framework covers broad capability areas including responsive breakpoint management, base typography and form element normalization, and fluid grid layouts. It ensures consistent visual formatting for buttons, lists, and tables across different web browsers.