Requirement 12
Multimedia
Provide an auditory description of the important information of the visual track of a multimedia presentation. If providing time-based multimedia such as a movie or animation, provide a synchronized equivalent.
If it is not possible to make the page accessible, provide a link to an alternative page that is accessible and contains equivalent information (or functionality).
(Reference: W3C: 1.3; 1.4; 11.4; DOJ, Section 508: b; k)