The MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps. It also has some developer-oriented documentation for Mozilla products, such as Firefox Developer Tools.
MDN Web Docs 网站提供开放网络（Open Web）技术有关的信息，包括用于网站和渐进式网络应用的 HTML、CSS 和 API。它还记录了一些用于 Mozilla 产品的面向开发者的文档，例如 Firefox 开发者工具。