For any time-based multi-media presentation (e.g., movie or animation) synchronize equivalent alternatives (e.g., captions or auditory descriptions of the visual track) with the presentation.
View an example of video with synchronized equivalent alternatives.
IBM's Webcast event: Perspectives (WMP format)
Viewing problems? Try going to the IBM Webcast event website.
Users who can't see the visual content of a multimedia presentation require an auditory description because they can't get close enough to the display monitor, have poor eyesight or they could be blind.
Users who can't hear the audio track require a text description. They may be working in a quiet environment, like a library, with the sound turned down or they might be in a noisy environment where the sound is obscured by noise. They could have poor hearing or could be deaf.
View WAI checkpoint 1.4 - For any time-based multimedia presentation (e.g., a movie or animation), synchronize equivalent alternatives.
View WAI checkpoint 1.3 - provide an auditory description of the important information of the visual track of a multimedia presentation.