---
root:
  items:
    - type: stacking-context
      bounds: [0, 0, 400, 400 ]
      items:
        - type: rect
          bounds: [0, 0, 400, 400 ]
          color: black
        - type: border
          bounds: [ 50, 50, 300, 300 ]
          width: [40, 2, 20, 50]
          border-type: normal
          style: solid
          color: white
          radius: [ 60, 30, [100, 50], [100, 50], 0.2, 0.0, -Inf, -0.7 ]