The intent of this success criterion is to provide people who are blind or vision impaired access to a multimedia presentation. The audio description augments the audio portion of the presentation with the information needed when the video portion is not available.
The techniques for GL 1.2 L1 SC2 are deemed to be sufficient by the WCAG Working Group for meeting success criterion 1.2 L3 SC3.
People who are blind or have low vision as well as those with cognitive disabilities who have difficulty interpreting visually what is happening benefit from audio descriptions of visual information.
A movie with audio description.
Transcript of audio based on the first few minutes of, "Teaching Evolution Case Studies, Bonnie Chen" (copyright WGBH and Clear Blue Sky Productions, Inc.)
Describer: A title, "Teaching Evolution Case Studies. Bonnie Chen." Now, a teacher shows photographs.
Bonnie Chen: These are all shot at either the Everglades...for today you just happen to be a species of wading bird that has a beak like this."
Describer: She hands them each two flat, thin wooden blades