MDN Web Docs
A definitive reference hub for HTML, CSS, JavaScript, and Web APIs.
MDN Web Docs is a comprehensive documentation site for core web platform technologies, including HTML, CSS, JavaScript, SVG, HTTP, accessibility, WebAssembly, and browser APIs. It combines reference pages, practical guides, beginner learning paths, compatibility-focused material, and small web development tools such as a playground and CSS generators.
Why it stands out
- Covers the open web platform rather than a single browser, framework, or vendor ecosystem.
- Balances formal reference material with guides, examples, and beginner learning paths.
- Maintained with visible community contribution workflows through MDN content repositories.
- Includes coverage of newer and security-relevant web features alongside long-established standards.
- Offers practical companion tools directly inside the documentation site.
Good to know
- Scope is centered on web platform technologies, so it is not a full reference for backend frameworks, build tools, or non-web programming environments.
- Some reference pages are dense and assume familiarity with web development terminology.
- New or experimental APIs still require careful compatibility checking before production use.
Under the radar: The Tools menu is easy to overlook; it includes quick CSS generators and an HTTP Observatory that can save a separate trip to standalone testing utilities.
Photos
Frontend developers use MDN to verify web-standard syntax, API behavior, and browser-facing implementation details while building sites and apps. Look up HTML elements, CSS properties, JavaScript objects, and Web API methods during development. Follow structured learning modules for HTML, CSS, JavaScript, and frontend fundamentals. Check examples and guides before using newer platform features such as Navigation API, Trusted Types, or CSS anchor positioning. Use built-in tools for quick experiments, HTTP checks, and CSS value generation.
Extensive references for HTML, CSS, JavaScript, Web APIs, SVG, MathML, HTTP, accessibility, WebAssembly, WebDriver, and web extensions. Includes tutorials and curriculum-style learning materials, a browser-based playground, HTTP Observatory, CSS generators, multilingual navigation, blog/news updates, and visible community contribution activity through MDN GitHub repositories.
Technical Notes
- MDN has introduced an MCP server that exposes MDN documentation and browser compatibility data to editors, IDEs, LLMs, and coding agents.
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Similar sites elsewhere
- web.dev — web.dev
- Can I use — caniuse.com
- DevDocs — devdocs.io
- W3Schools — w3schools.com
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