Audio and Video

• Introduction
• Provide text for audio content: Some users cannot access audio. Supply a text transcript of audio content; when audio is part of video, also synchronize the transcript as captions.
• Provide descriptions for video content: Some users cannot access video. Use synchronized descriptions to provide pertinent details about video, along with a separate file containing text descriptions and the audio transcript for users who cannot access video files.
• Provide alternate formats for media-based content: Many factors can impede access to media, including physical or technical limitations. When providing content using audio and video, supply alternatives so users can choose the version that best suits their needs and preferences.
• Make media keyboard accessible: Some users navigate the Web using the keyboard. Make sure media controls—such as play and pause—respond to keyboard commands, so users who rely on keyboard navigation can control media playback.
• Allow users to control media playback: Users should decide when to access media. Make loading and playback of media an explicit user choice, and provide controls for playing, pausing, and controlling volume.