"Based on HTML5, EPUB 3 adds support for rich media (audio, video), interactivity (JavaScript), global language support (including vertical writing), styling and layout enhancements, SVG, embedded fonts, expanded metadata facilities, MathML, and synchronization of audio with text and other enhancements for accessibility."
In the "tech specs" page, it says the supported file formats are:
Books: ePUB, including fixed layout and enhanced ePUB. Images: JPG, PNG, GIF, BMP Audio: MP3, AAC, .3gp, mp4, m4a, flac, ogg, wav, mid. Video Formats: 3gp, mp4, webm
What does "enhanced ePUB" mean? Is it the same as EPUB 3?
The International Digital Publishing Forum (IDPF) recently voted to elevate EPUB 3 to a final IDPF Recommended Specification. http://idpf.org/epub3-a-final-recommendation
"Based on HTML5, EPUB 3 adds support for rich media (audio, video), interactivity (JavaScript), global language support (including vertical writing), styling and layout enhancements, SVG, embedded fonts, expanded metadata facilities, MathML, and synchronization of audio with text and other enhancements for accessibility."