The document discusses eliminating costly conversions between file formats in publishing workflows by authoring books directly in HTML5. It outlines a traditional publishing process that involves three standard conversions between Word, InDesign and EPUB/MOBI formats. The author argues the goal should be eliminating unnecessary conversions by realizing HTML and CSS can be used across all outputs. O'Reilly Media developed an open HTML5 specification called HTMLBook and an authoring platform called Atlas that allows one-click publishing to print and digital formats from a single HTML5 source file.