In this master thesis we will analyse existing functionalities and approaches to increase security of web pages. Based on the outcomes and the overview of the most abused functions by the XSS attacks we will construct a program library. Purpose of the library will be to enhance security, integrity and availability of the sensitive functions within execution environment of the web content. The Design will be based on the object-capabilities model and will manifest proposed ideas by similar approaches.
Since the library will modify execution environment, all modified functions will be tested for execution overhead.