Foundation for Sites

Health v2 · maintenance only

Flags: no_license

Adoption not part of the score

29798 stars · 5389 forks observed · 2026-10-14

What it is AI-extracted, prompt v1, taxonomy v1, 2026-10-05, confidence 0.98

Yeti (formerly Foundation for Sites) is a CSS‑first, zero‑build layout and styling framework that provides intent‑based layout primitives, theming tokens, and accessible components. It ships as a single stylesheet and requires no build tools to use.

Use cases

• Create responsive website layouts with pure CSS and no JavaScript bundling
• Apply a consistent visual system across a site using a single token scale
• Build accessible UI components that work out‑of‑the‑box in modern browsers
• Prototype web pages quickly by linking a single stylesheet
• Implement container‑query based designs without a preprocessor

When to choose

• You need a modern CSS framework that leverages native browser features like container queries and cascade layers
• You prefer zero‑build integration and want to avoid Sass or Node tooling
• Accessibility and semantic markup are important for your project
• You target browsers that meet the Baseline 2025 support level

When to avoid

• Your project must support older browsers that pre‑date the Baseline 2025 specifications
• You need a component library built with Web Components or JavaScript interactivity
• You require a utility‑first framework like Tailwind CSS
• You need a full‑stack UI framework with built‑in JavaScript widgets

Facets

framework · maturity active

css-framework web-development frontend web-design browser cross-platform zero-build intent-based-layout accessible native-css container-queries baseline-2025

Member repositories

For agents

markdown · JSON · MCP: product_card(name="foundation/yeti")