OPScript: the language for the educational browser yadbrowser

In this paper the main characteristics of the OPScript language are described. This language was created to be used as the script language of the educational browser YADBrowser. The main difference between YADBrowser and current browsers is that it allows to add new characteristics to its object model in a persistent way using a feature called persistent dynamical additions. This allows adapting a given application to the skills of the student that makes use of it. The OPScript language has many new features which can be considered as a natural evolution from current script languages for Web.