About

Version: WCAG 2.0+
Number: 1.2.7
Level: AAA
Applicability: Video with accompanying audio
Requirement:

Where pauses in foreground audio are insufficient to allow audio descriptions to convey the sense of the video, extended audio description is provided for all prerecorded video content in synchronized media.

Guidance:

Purpose

The purpose of this success criterion is to ensure that users who are blind or visually impaired can access the non-visual content (e.g., the actions of individuals, changes in scene, etc.) of a video through an extended audio description track.

How to Meet

Meeting this success criterion is similar to 1.2.5 except that it requires the use of extended audio descriptions. An extended audio description track differs from a standard audio description track in that playback is paused, where necessary, to allow for more in-depth explanations than are possible between the natural breaks in the audio track.

This success criterion does not apply when it is possible to provide all the necessary information for the reader without pausing playback (i.e., through a standard audio description track).

Note

Ebook formats typically do no support the use extended audio descriptions, so meeting this requirement is not practical in most cases.

Additional Information

The knowledge base does not currently include information on providing extended audio descriptions due to the lack of implementation in publishing formats. Refer to the WCAG guidance documents for additional information.