Technique SM1:Adding extended audio description in SMIL 1.0| www.w3.org
Technique H96:Using the track element to provide audio descriptions| www.w3.org
Technique G8:Providing a movie with extended audio descriptions| www.w3.org
Understanding Test Rules for WCAG 2 Success Criteria| www.w3.org
Understanding Techniques for WCAG 2.2 Success Criteria| www.w3.org