Where to Go from Here
Obviously I didn’t cover every aspect of creating EPUB in this article. For instance, in InDesign CS5.5, placed audio and h.264 video files are enclosed in HTML5 <audio> and <video> tags in the resulting EPUB file. That opens up some really cool possibilities, but just know that support for audio and video in EPUB is still in its infancy. So to continue your learning, check out this InDesign to iPad white paper as well as the Digital Publishing Technology Center.