The Web Content Accessibility Guidelines (WCAG) defines how to make web content more accessible to people with disabilities.
The section on Time-based Media is broken down into three levels of compliance.
Level A
- Captions
- Audio Description or Full Text Transcript
Level AA
- Captions
- Audio Description
Level AAA
- Captions
- Extended Audio Description
- Sign Language
- Full Text Transcript
Captions
- Include dialogue and non-speech information conveyed through sound, including meaningful sound effects.
- Captions may be closed (toggled on/off) via a separate SRT or VTT file, or hardcoded (always on) via open captions or SDH subtitles.
Audio Description
- Adds descriptive narration of key visual elements during natural pauses in the audio to make video more accessible to the visually impaired.
- Intended to play in real-time along with the existing audio mix.
Extended Audio Description
- If the action in your video happens too quickly and there aren't enough natural pauses to fit the audio description, you must provide an extended version.
-
This is where the video pauses briefly to allow the longer description to play.
Sign Language
-
Translation of one language, generally a spoken language, into a sign language.
Full Text Transcript
- Includes all spoken audio and descriptions of the important visual information.
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