The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

This is the source for MDN Web Docs, the reference website covering HTML, CSS, JavaScript, and browser APIs that developers use every day. Anyone can contribute by submitting a pull request.

GitHub repo for the MDN Learning Area.

Browser compatibility data for Web technologies as displayed on MDN

Example Firefox add-ons created using the WebExtensions API

Code examples that accompany various MDN DOM and Web API documentation pages

A series of web components examples, related to the MDN web components documentation at https://developer.mozilla.org/en-US/docs/Web/Web_Components.

It's online. It's offline. It's a Service Worker!

7 community-maintained translations of MDN Web Docs in ES, FR, JA, KO, PT-BR, RU, and ZH, to learn and contribute in your native language.

The project that powers MDN.

Local Library website written in Django; example for the MDN server-side development Django module: https://developer.mozilla.org/en-US/docs/Learn/Server-side/Django.

Code examples that accompany the MDN Web Docs pages relating to Web Audio.

A repository for demos illustrating features of the Web Speech API. See https://developer.mozilla.org/en-US/docs/Web/API/Web_Speech_API for more details.

Planning and proposals for MDN Web Docs content

The platform code behind MDN Web Docs

Local Library website written in NodeJS/Express; example for the MDN server-side development NodeJS module: https://developer.mozilla.org/en-US/docs/Learn/Server-side/Express_Nodejs.

Code examples that accompany the MDN JavaScript/ECMAScript documentation

Code examples that accompany the MDN WebGL documentation

Code examples that accompany the MDN WebAssembly documentation — see https://developer.mozilla.org/en-US/docs/WebAssembly.

Examples for progressive web apps.

MDN samples server; used for samples that can't be hosted in-place on MDN, plus back-end server-side code for samples that need it.

This repository contains general data for Web technologies

Service Worker test repository. This is a very simple demo to show basic service worker features in action.

(Deprecated) Home of the MDN live code editor interactive examples

Web Audio API-powered voice changer and visualizer

A simple web worker test.

Code examples that accompany the MDN CSS documentation

A repository of Fetch examples. See https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API for the corresponding documentation.

A sample MDN app that uses getUserMedia and MediaRecorder API for recording audio snippets, and The Web Audio API for visualizations.

Enhanced version of the to-do app, which stores to-do items via IndexedDB, and then also aims to provide notifications when to-do item deadlines are up, via the Notification and Vibration APIs.

MDN front-end developer curriculum

A simple one page website created to help complete beginners learn HTML basics.

A single-page website created to help complete beginners learn HTML with JS added to help beginners learn JavaScript. Supports https://developer.mozilla.org/en-US/Learn/Getting_started_with_the_web/JavaScript_basics

Sample todo app built with the React/ReactDOM framework.

A simple one page website created to help complete beginners learn HTML basics, which in this repo has also been styled to help beginners learn CSS basics. The styling is explained over the course of https://developer.mozilla.org/en-US/Learn/Getting_started_with_the_web/CSS_basics.

Violent theremin uses the Web Audio API to generate sound, and HTML5 canvas for a bit of pretty visualization. The colours generated depend on the pitch and gain of the current note, which are themselves dependant on the mouse pointer position.

Basic blog site written in Django (part of MDN Django module assessment).

MDN's frontend since late 2025, built with Web Components, Lit, and SSR for a fast, clean documentation experience. Fred = /fr(ont)e(n)d/.

A simple demo to show shared worker basics.

A place to provide feedback and suggestions for MDN Web Docs

Using the <canvas> element to do software rendering of a 3D environment with ray-casting

Archived: MDN Web Docs issues are tracked in the content repository.

Sample todo app built with the Vue framework

Bringing scripting to the wiki bears.

Backend for HTTP Observatory on MDN

The base Sass for Mozilla Developer based projects and products

Code examples that accompany the MDN HTML documentation: https://developer.mozilla.org/en-US/docs/Web/HTML

MDN's prototype MCP server

This content kit provides learning material to allow intermediate web developers to level up their skills, learning real world techniques to take them past rudimentary syntax towards a solid foundation of skills than can be utilized to create modern web applications. It'll be visual; you'll have fun along the way.

A set of simple tests for testing WebVR functionality. See https://developer.mozilla.org/en-US/docs/Web/API/WebVR_API for the latest on the documentation.

(Deprecated) Builder of Bits, powered MDN's interactive examples 2018–2025

Examples to support the MDN resource covering Firefox headless mode — see https://developer.mozilla.org/en-US/Firefox/Headless_mode

The code that generates the MDN Web Docs Developer Portal.

The clean kuma (🤖🧹)

Archived MDN Web Docs content that is not actively maintained or frequently built

MDN Web Docs tool to covert HTML to Markdown

Web Audio API-powered voice changer and visualizer

[UNMAINTAINED] A simple template for writing web apps into, to save you some time when experimenting. Used in MDN web app demos. See https://developer.mozilla.org/en-US/docs/Web/Apps/App_coding_guidelines#Apps_template for more information on what this template contains.

Rari is a Rust-based build system that transforms markdown into structured JSON, powering MDN Web Docs content and translations since 2024.

(Deprecated) MDN Web Docs Infrastructure scripts and configuration

Reusable GitHub Actions workflows

The MDN Learning Area code examples translated into Brazilian Portuguese.

CSS Houdini examples relating to MDN content.

WordPress plugin automatically links keywords and phrases to MDN.

Code examples that accompany the MDN IndexedDB documentation

[archived] The starting state of the example built up in the "Your first app" tutorial found in the Mozilla Developer Network open web app Quickstart article.

Mozilla's Cross-Browser Testing Lab

(Deprecated) Jenkins ansible playbook

A repository for media and assets to be used across MDN Web Docs

MDN Web Docs Product Advisory Board

(Deprecated) Make Sphinx docs look like MDN

Interactive diagram showing what parts of the web technology stack can used for different purposes when creating games. Includes links to more information about each.

Archived! | Use WebExtensions instead | Add-ons demonstrating how to use content scripts in the Add-on SDK.

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(Deprecated) Content for https://mdn.dev

MDN Web Docs public organization profile

API for browser compatibility data on developer.mozilla.org

A simple demo to show usage of the Mozilla Browser API. See https://developer.mozilla.org/en-US/docs/Web/API/Using_the_Browser_API for more details.

A scalable set of icons for use across Mozilla Developer websites

An Ember-based app, built as a sample to demonstrate Ember/Ember CLI and modern web architecture. This goes along with the article series found at https://developer.mozilla.org/en-US/Apps/Build/Modern_web_app_architecture.

A curated list of awesome projects powered by (and powering) MDN Web Docs

This is the repo to fork or clone when creating a new MDN Content Kit.

The repo that powers MDN Web Docs Insights.

A web worker that calculates fibonacci numbers.

Experimental German locale for MDN, aimed at German-speaking users that prefer to read MDN Web Docs in their native language

MDN Web Docs Front-End style guide

This is a Content Kit for people who want to teach programming to beginners.

A project template to use for new MDN GitHub repositories

Examples related to MDN performance documentation; see https://developer.mozilla.org/en-US/docs/web/Performance

UI components for MDN Web Docs

Repository for examples to go along with MDN IMSC documentation.

A place for agendas and minutes from regular MDN community meetings

A historic collection of MDN Web Docs content and examples

[ARCHIVED] Collects web code for analysis and reporting.

This add-on lets you send remote debugging protocol requests to the debugging server, and displays the response.

Short descriptions of web platform features, for flexible usage in applications.

A demo to show how the AudioChannels API works, at a basic level

Repo for View Source Conference site

[ARCHIVED] The finished version of the example built up in the "Your first app" tutorial found in the Mozilla Developer Network open web app Quickstart article.

Examples showing how to port add-ons to be e10s-compatible

Toolkit for visualizing and editing MDN's browser compatibility data

Webextension to lint MDN documents

A simple demo showing usage of the Whitestorm.js 3D web library.

Content previously, but no longer displayed on MDN Web Docs.

Live version of our sample todo app built with the React/ReactDOM framework.

Feedback about AI Help

Demo project for the MDN client-side web development tools tutorial.

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Linting rules used to lint MDN Web Documents

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Small app to display bugzilla bugs which need dev docs

An accurate CSV record of who made what revisions to MDN Web Docs when it was a Wiki platform

MDN's deployment infrastructure.

Compile WAT to WASM with WASM 🙇

Inventory of MDN content

Retired Archived MDN Content

MDN Simple Storage Service (S3) configuration

DEPRECATED: Kubernetes Helm charts for the Mozilla Developer Network (MDN).

MDN's macro grammar for tree-sitter

Content for the contributor spotlight on MDN Web Docs

German translations of the MDN Learning Area examples

🚢 those static Stumptown sites

Repo for organising MDN Web Docs team projects & subsequent work

Temp repository to define issue & pr processes with mermaid flow charts

Browsercompat - Contribution & Moderation UI

Automate the heck outta MDN Kuma deployment process

All translated (non-archived) MDN content in fully rendered form

Various pieces of generic MDN content

Experimental Italian locale for MDN, aimed at Italian-speaking users that prefer to read MDN Web Docs in their native language

Browser Compatability Data

Archive of KumaScript Templates / macros, 2005-2016

This is a repository for testing machine translations of English content.

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