Writing applications for multiple operating systems and a wide range of mobile devices can be challenging. The high demand for sophisticated mobile applications requires significant hardware. One solution is to provide Web applications, because they can run cross-platform on mobile devices. You don't need to use proprietary technology (such as Objective-C with Cocoa on the iPhone); you can use common Web technology. In essence, just one version of the application is needed. The main hardware power is provided by servers. In this article, explore the use of Web development in the mobile application space with a simple example that taps into the HTML5 standard.