The development of ubiquitous applications for ambient intelligence environments needs to also take into account some usability and accessibility issues in order to ensure a proper user experience and to overcome the existing content access barriers. A proper access to video subtitles, for instance, is not always available due to the technical limitations of traditional video packaging, transmission and presentation. New Web standards enable more featured applications with better multi-platform definition, so they are suitable for building ubiquitous applications for ambient intelligence environments. This work presents a video subtitling system that enables the customization and adaptation of subtitles. The benefits of Web applications compared with device-specific native applications for building the solution as well as its current platform support are analyzed. Finally, three different application use cases are presented
