Regarding the Dojo UI framework, you'll learn about Dojo Mobile in detail. Dojo Mobile, an extension for Dojo Toolkit, provides a series of widgets, or components, optimized for use on a mobile device, such as a smartphone or tablet. The Dojo framework is an extension of JavaScript and provides a built-in library which contains custom components such as text fields, validation menus, and image galleries. The components are modelled on their native counterparts and will look and feel native to those familiar with smartphone applications. The components are completely customizable using themes that let you make various customizations, such as pushing different sets of styles to iOS and Android users.