Mozilla Developer Network (MDN) is an open and collaborative learning platform for Web technologies (HTML, CSS and JavaScript). MDN goes beyond providing essential coding information; it addresses developers’ needs through its supporting community of volunteer developers, with the aim of inspiring ideas, encouraging collaboration and ultimately, fostering the growth of the open Web. For a wide range of Web developers, from learners to hobbyists to full‐time professionals, MDN provides useful explanations for coding practice, instructions on downloading and building code, articles on how the code works. It also gives guidance on how to build add‐ons for Mozilla applications and apps for Firefox OS, user‐submitted runnable demos of Web technologies, and helpful answers on development planning and strategy.