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MDN Web Docs

MDN Web Docs

coding / ProgrammingWeb DevelopmentAPIs & Integrations
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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

Illustration for MDN Web Docs