Chapter 5 discusses the capabilities of RIA frameworks in the context of multimedia content support. For this purpose, several alternatives for implementing video playback functionality are presented by using both JavaScript-based RIA frameworks to and non-JavaScript-based RIA frameworks. Examples of JavaScript-based RIA frameworks having multimedia content support are Dojo, jQuery, Prototype, and Mootools. Examples of non-JavaScript-based RIA frameworks are Adobe Flex™, JavaFX™, Silverlight™, and OpenLaszlo. For each case study the mandatory files are mentioned. The chapter also shows a screenshot where video player is displayed and code snippets that were used are presented. Finally, a comparative analysis of video playback support for each framework is presented in terms of video container formats and encoding types.