mdn

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.

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 WebAssembly documentation — see https://developer.mozilla.org/en-US/docs/WebAssembly.

Code examples that accompany the MDN WebGL documentation

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...

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...

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...

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/.

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

A simple demo to show shared worker basics.

MDN's prototype MCP server

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.

Backend for HTTP Observatory on MDN

Sample todo app built with the Vue framework

Bringing scripting to the wiki bears.

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

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...

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

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

Web Audio API-powered voice changer and visualizer

Reusable GitHub Actions workflows

[UNMAINTAINED] A simple template for writing web apps into, to save you some time when experimenting. Used in MDN web app demos. See...

(Deprecated) MDN Web Docs Infrastructure scripts and configuration