For prerecorded audio-only and prerecorded video-only media, the next are correct, other than in the event the audio or online video is actually a media alternate for text and is also clearly labeled therefore: Prerecorded Audio-only Note: the same backwards compatibility notion applies to conformance levels; Each individual accomplishment conformance https://jsxdom.com/web-accessibility-audits-wcag-2-1-compliance-services/