Yes. jQuery supports cross platform with html-5. It is not necessary to develop unique apps for different platforms and browsers for a single application.
jQuery Mobile provides a powerful theming framework that allows developers to customize color schemes and certain CSS aspects of UI features. Developers can use the jQuery Mobile ThemeRoller application to customize these appearances and create highly branded experiences. After developing a theme in the ThemeRoller application, programmers can download a custom CSS file and include it in their project to use their custom theme.
Each theme can contain up to 26 unique color "swatches," each of which consists of a header bar, content body, and button states. Combining different swatches allows developers to create a wider range of visual effects than they would be able to with just one swatch per theme. Switching between different swatches within a theme is as simple as adding an attribute called "data-theme" to HTML elements.
The default jQuery Mobile theme comes with 5 different color swatches, named "a", "b", "c", "d", and "e". Here is an example of how you would create a toolbar with the "b" swatch:
<div data-role="header" data-theme="b"> <h1>Page Title</h1> </div>