Slidy is a tool for creating standards-based presentations, it is based on XHTML, CSS, and JavaScript. XSLidy is an extension of the original Slidy idea. XSLidy is an XSLT-based tool (hence its name) which allows users to create simple XML files for their presentations. These XML files are then processed to generate one or more Slidy presentations, allowing cross-presentation links, advanced navigation features, and the ability to add custom elements by simply adding another layer of XSLT code.