master-co/css

Health v2 · maintenance only

Flags: prerelease_only

Adoption not part of the score

1945 stars · 44 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Master CSS is a virtual CSS language and framework that lets developers style HTML entirely through enhanced class-name syntax, with a runtime engine that observes the DOM and generates real CSS rules automatically. It supports responsive breakpoints, states, selectors, color schemes, and hybrid server-side rendering in roughly 14KB, with framework-agnostic setup and a VS Code language service.

Use cases

• style web UIs without writing separate CSS files
• build a design system using only HTML class names
• add responsive styles with breakpoint variants in markup
• pre-generate CSS on the server for SSR apps like Next.js
• quickly prototype pages via a CDN script tag
• replace utility-first frameworks like Tailwind with a new CSS syntax
• get syntax highlighting and autocomplete for class names in VS Code

When to choose

• you want utility-first styling with a more structured, near-native CSS syntax
• you need zero-config setup that works via CDN or any framework (React, Vue, Angular, Svelte, Laravel)
• you want runtime JIT styling plus server-side pre-generation (hybrid rendering)
• you need broad browser support including IE 11 via Mutation Observer

When to avoid

• your team prefers traditional semantic CSS classes and stylesheets
• you rely on an ecosystem of plugins built for Tailwind CSS
• you dislike learning a custom class-name syntax for styling
• you need a full component library rather than a styling engine

Facets

framework · maturity active

css-framework frontend-framework ui-components ssr theme web-development frontend web-design browser cross-platform virtual-css utility-first atomic-css jit zero-runtime markup-driven responsive-design vscode-extension cdn nodejs web-server

Member repositories

For agents

markdown · JSON · MCP: product_card(name="master-co/css")