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The Struts 2 tags have a theme attribute you can use to specify which Struts 2 theme should be used when creating the HTML for that tag. The values for the theme attribute are simple, xhtml, css_xhtml, and ajax. To learn more about these themes visit Themes and Templates Documentation. This tutorial will review the xhtml, css_xhtml, and the simple themes. The ajax theme is a special theme used for ajax operations (see Ajax Theme in the documentation.

You can specify the theme on a per Struts 2 tag basis or you can use one of the following methods to specify what theme Struts 2 should use:

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