Whenever content is presented in a format that will not be accessible to all users, an alternative format must be included. Specific examples are listed below:
If (1) prerecorded web-based audio is being used (e.g., audio podcasts, MP3 files, audio descriptions, etc.), or (2) prerecorded web-based video is being used, and there is no audio track, then a descriptive text transcript must be provided.
If a web-based video includes visual content that is not present in the audio track, then an audio description must be provided. Audio descriptions are added to the soundtrack, and describe visual content that cannot be obtained from the original audio track alone.
If web-based synchronized media is being used (e.g., video, presentations, etc.), then synchronized open captions must be provided.
CEL Accessibility Guidance (derived from WCAG 2.0) Addressing the Use of Descriptive Text and Audio: