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OGCIO

Level AAA − WCAG 2.0 Success Criterion 1.2.8 − Media Alternative (Prerecorded)

This success criterion is meant to target at users with impaired hearing and vision. This "alternative" is not like a caption or a subtitle. Instead, full descriptions are provided for all visual information, including visual context, actions and expressions of actors, and any other visual materials. In addition, non-speech sounds (laughter, off-screen voices, etc.) are described, and transcripts of all dialogues are included. The media alternative is generally provided in text so it can be read using assistive technologies.

Before Rectification

A webpage sample containing a video recording without a text transcript and description.

When video content is displayed as above, a visually impaired person will only hear the audio and a hearing impaired person will only see the pictures.

After Rectification

A webpage sample containing a video recording with a text transcript and description.

To improve accessibility, a text version is added. However, this text version is more than a transcript of the audio. It also describes what is taking place within the video.

WCAG 2.0 Reference:

http://www.w3.org/TR/UNDERSTANDING-WCAG20/media-equiv-text-doc.html