Platform software offers documented accessibility services through which other software and assistive technology interoperate, and user interface software uses them (or other documented services where those fall short). Through them each element exposes its name, role, description, state and boundary, table rows, columns and headers, value and range, label and parent-child relationships, text and its attributes, available actions and, where security allows, their execution, focus and selection tracking and change, change notifications, and modification of states, values and text.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.