A threshold ramp at a doorway on the path has a rise of no more than 35 mm, runs 280 mm or less, rises no steeper than 1:8, lies no more than 20 mm from its door leaf, and has edges tapered or splayed at 45 degrees or more where it does not meet a wall. The 2021 edition adds sharp transitions at the top and bottom and at the tapered or splayed edges.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.