Object Style Options now has an new Export Tagging feature. Learn more about it in this video from Train Simple's InDesign Training.

Learn about the new EPUB 3 option in the Export EPUB dialog box. Anne-Marie Concepción shows how to validate the resulting EPUB with epubcheck 3. She then opens it to show some of the EPUB 3-specific features such as the TOC.xhtml file with its HTML5

Learn how to markup text with InDesign styles for HTML, EPUB, or tagged PDF output. Add CSS class names to the exported content, so that in EPUB/HTML export, you can differentiate between slight variations in styling, or when tags are mapped to the basic styles such as p, h1, and h2.

In InDesign CS5.5, you can map paragraph and character styles directly to EPUB, HTML and PDF tags to ensure that styles you define in InDesign are exported appropriately. You can also add CSS class names and type n your own custom tags.