---
root:
  items:
    - type: stacking-context
      bounds: 50 50 200 200
      items:
        - type: rect
          bounds: 0 0 50 200
          color: red
        - type: rect
          bounds: 50 0 50 200
          color: green
        - type: rect
          bounds: 100 0 50 200
          color: blue
        - type: rect
          bounds: 150 0 50 200
          color: black