In this article, the main characteristics of the educational browser YADBrowser are described. One of the main objectives of this project is to define new languages and object models which facilitate the creation of educational applications for the Internet. The fundamental characteristics of the object model of the browser are also described. YADBrowser markup language is inspired by HTML 4. In this article, the main differences between them are mentioned. The fundamentals of the OPScript language are also exposed. It was created to be used as the script language for the browser. The relations between this project and other efforts aiming to define new languages and browsers for domain specific applications are defined.