Technologies for how a rich user interaction can be delivered have changed a lot during the last 10 years. From a world where these types of user interfaces predominately was built as desktop applications like Windows Applications over to web technologies using Java Applets, Flash, Silverlight, Android, iOS etc. The problem though has been the vast amount of different technologies with no or limited connections between them. This has so far been a problem for application developers since essentially no code can be reused between the different platforms but also that some of them are not native – some kind of runtime platform needs to be installed (Flash, Silverlight, Java…). With the introduction of the emerging standard of HTML5 it seems that there is finally a technology that is getting more widely used by most of the platform suppliers.  This Master Thesis aims to prove the HTML5 can be used to build clients for MediusFlow. The point is to investigate if it’s possible to implement all the pages of frontend on different platforms by using idea like Responsive Web Design with HTML5.The showcase will be to build a complete app for MediusFlow on the iPad platform based on HTML5. In addition the interface must be verified on at least one additional platform, most probably Internet Explorer 10.