Audio-only (Live)

Understanding WCAG2.0

"Alternative content of time-dependent media" as required in 1.2.8 is applied to live audio. Although it is required to prepare accurate alternative contents for live audio such as radio broadcasting, this is a very difficult achievement standard.

Principle Perceivable Information and user interface components must be presentable to users in ways they can perceive.
Guideline Time-based Media Provide alternatives for time-based media.
Criterion Audio-only (Live)
(1.2.9 AAA)
Alternative content of time-based media that presents equivalent information to content that only includes live audio is provided.

URL of Techniques for WCAG 2.0