MDN Web Docs is an evolving learning platform for Web technologies and the software that powers the Web. MDN's mission is simple: to provide developers with the information they need to easily build projects on the open Web.

Every part of MDN (docs, demos, and the site itself) is created by an open community of developers building resources for a better Web, regardless of brand, browser, or platform. Anyone can contribute, and each person who does makes us stronger. Together we can continue to drive innovation on the Web to serve the greater good. It starts here, with you.
https://developer.mozilla.org/en-US/docs/MDN/Contribute