---
root:
  items:
    - type: stacking-context
      bounds: [0, 0, 50, 50]
      items:
        - type: border
          bounds: [ 0, 0, 50, 50 ]
          width: [ 10, 10, 10, 10 ]
          border-type: radial-gradient
          center: [ 25, 25 ]
          radius: [ 50, 50 ]
          stops: [ 0.0, red, 1.0, green ]