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🦊 MDN Web Docs

The official web standards reference — HTML, CSS, and JavaScript documentation

🔗 Go to MDN Web Docs
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Dev
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Mozilla
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About

MDN Web Docs is Mozilla's platform for web technology documentation. It covers every web standard — HTML, CSS, JavaScript, and Web APIs — with precise references, interactive code examples, browser compatibility tables, and learning guides. From beginners to senior engineers, it's the authoritative source for web development.

Key Features

💡 Tips

  • When Googling a CSS property or JS method, prefix your search with 'mdn' (e.g., 'mdn flexbox') to land directly on the MDN article.
  • Check the 'Browser compatibility' table at the bottom of each article to see which browsers and versions support a feature.
  • Use the interactive 'Try it' editor on each page to tweak code and see live results without leaving the docs.

Frequently Asked Questions

Is MDN free?

Completely free. It's run by the Mozilla Foundation as a non-profit service with no ads.

Is there a non-English version?

Key articles are translated into many languages including Korean, Japanese, and Spanish. Visit developer.mozilla.org and select your language from the header.

How is it different from W3Schools?

MDN is the authoritative standards reference maintained by Mozilla, with high accuracy. W3Schools is more beginner-friendly and tutorial-focused. For spec accuracy, MDN is the better source.