The intent of this Success Criterion is to provide people who are blind or visually
impaired access to the visual information in a synchronized media presentation. This
Success Criterion describes two approaches, either of which can be used.
One approach is to provide audio description of the video content. The audio description
augments the audio portion of the presentation with the information needed when the
video portion is not available. During existing pauses in dialogue, audio description
provides information about actions, characters, scene changes, and on-screen text
that are important and are not described or spoken in the main sound track.
The second approach involves providing all of the information in the synchronized
media (both visual and auditory) in text form. An alternative for time-based media
provides a running description of all that is going on in the synchronized media content.
The alternative for time-based media reads something like a screenplay or book. Unlike