Provide media alternatives of video

Example of a video with colorful shapes and a text description below
Image description: A video player with a play button in the middle. The caption below says, "4 colorful rectangles (green, purple, blue, and pink) bouncing around on a yellow background." This represents a text description of the visuals in the video.

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Why This is Important

Media alternatives describe all the visual and auditory content to a Blind, Deaf, and Deaf-Blind audience.

A media alternative reads like a screenplay or book. It includes all the visual information (scenery, context, actions, visual descriptions) and auditory information (transcript of all speech and non-speech sounds) in a text format. Media alternatives are accessible to audiences who may not be able to hear audio descriptions well and may not be able to see visuals and captions well - so primarily Blind, Deaf, and Deaf-Blind people.

This references WCAG criterion 1.2.8 Media Alternative (Prerecorded) (Level AAA).

How to Implement This

Note - There are not a ton of resources or examples out there for this. Most accessibility techniques related to time-based media refer to audio descriptions, transcripts, and captions. If you have any suggestions, please add them below.

How to Test This

This requires manual testing. If there is pre-recorded video present, look for the presence of a media alternative.

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