Web content conforms to WCAG 2.1 guideline 1.3: structure and relationships are programmatically exposed, reading order is meaningful, instructions do not rely only on shape, position or sound, orientation is not locked, and common input fields declare their purpose (1.3.1 to 1.3.5).
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.