Sign Language (Prerecorded)

Understanding WCAG2.0

Sign language interpreter is applied to all recorded synchronized media existing on the page. Sign language interpreter for live video is not required here, but it is still better if there is.

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 Sign Language (Prerecorded)
(1.2.6 AAA)
Sign language interpreters are provided for all recorded sound contents included in synchronized media.

URL of Techniques for WCAG 2.0