Time-Based Media

Content that unfolds over time, including audio, video, audio-video combinations, and interactive multimedia presentations. WCAG Guideline 1.2 requires that time-based media be made accessible through alternatives such as captions for the deaf and hard of hearing, audio descriptions for blind users, transcripts, and sign language interpretation. Time-based media accessibility is the single most discussed accessibility topic among developers on Stack Overflow, reflecting the complexity of providing synchronised captions, audio descriptions, media alternatives, and accessible media player controls. The challenge increases with live content, where real-time captioning and audio description must be provided simultaneously with the broadcast.