S5 (file format)

S5 (Simple Standards-Based Slide Show System) is an XHTML-based file format for defining slideshows. It was created by Eric A. Meyer as an alternative to the browser-centric Opera Show Format. S5 is not a presentation program, but fulfills the same purpose in combination with a standards-compliant web browser.

History
The initial version of S5 was released by Eric Meyer on October 18, 2004 under a Creative Commons license. With the release of version 1.1 on July 28, 2005, S5 was placed in the public domain.

On July 17, 2006, Ryan King launched s5project.org, "a new community site, dedicated to the S5 Presentation software".

On December 4, 2006, Andreas Gohr announced a DokuWiki plugin that converts Wiki markup to XHTML-compatible S5 presentations.

Structure
The content of an S5 presentation can be stored in a single XHTML file. This file contains several slides which are structured in the following way:

S5 presentations can be viewed in outline and slideshow mode; Cascading Style Sheets are used to define different layouts for outline, slideshow and print. Navigation controls, a dynamically generated list of slides and accesskeys allow browsing back and forth.

A more semantic version of the S5 format is based on the XOXO microformat and uses  instead of divs for the slides, as well as   instead of a div for the overall presentation.