Provide alternatives for audio and video on a website. Include controls so that the user can stop, play, and pause the content.
It is necessary for video and multimedia to include synchronized captions and transcripts. If a video has narration, it is also best practice for narration to describe the actions in the video, such that a blind person listening to the video can understand what is happening on the screen. For example, in a screen capture video showing how to use a piece of software, the narrator should describe which buttons or menu items are being selected, and how the screen changes in reaction to those clicks.
Separate descriptive audio tracks, while helpful, are not supported by many common online video players, and also may be prohibitively expensive to produce. For these reasons, synchronized captions and descriptive narration are considered sufficient to enhance the accessibility of videos at this time.
Platforms like YouTube may attempt to automatically generate captions. Those captions may be used as a starting point, but they are too unreliable to be sufficient. When using YouTube automatic captions, it is important to edit the caption file.
Use the WCAG links provided to get detailed guidelines on how to achieve accessibility for this scenario.