Media - Audio and Video only (Pre-recorded)
Audio-only content with no video is not accessible to users who are deaf or hard of hearing.
Video-only content with no audio is not accessible to screen reader users.
For prerecorded audio-only content, provide a text-based transcript alternative.
For prerecorded video-only content, provide a text-based transcript, as well as an audio description track when there is visual or other descriptions (such as speaker identification and scene descriptions) when more than just the verbatim spoken content is not sufficient.
Ensure that transcripts are accessible and easily discovered (such as placing a link immediately before or after the embedded video).