It’s now time to turn our attention to the features that EPUB 3 introduces to expand on the traditional reading experience; the excitement around EPUB 3 doesn’t come from text and images, after all.
This section takes focus on the dynamic aspects of EPUB 3. Rich media, audio integration, and scripted interactivity are all new features that have been added in this version. Some of these features, like audio and video support and scripting, introduce new accessibility challenges, while others, like overlaying audio on your text content and enhancing text-to-speech rendering, improve access for all. (The members of this latter group are also commonly referred to as accessibility superstructures, because they are added on top of core EPUB content to enhance accessibility.)
But let’s get back to business of being accessible…