Web content conforms to WCAG 2.1 guideline 1.2: alternatives for pre-recorded audio-only and video-only media, captions for pre-recorded and live synchronised media, and audio description or a media alternative for pre-recorded video (success criteria 1.2.1 to 1.2.5).
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.