---
root:
  items:
    - type: stacking-context
      bounds: [0, 50, 200, 100]
      items:
        - type: rect
          bounds: [10, 10, 80, 100]
          color: [255, 0, 0, 0.7]
        - type: rect
          bounds: [50, 10, 80, 100]
          color: [0, 255, 0, 0.7]
        - type: rect
          bounds: [90, 10, 80, 100]
          color: [0, 0, 255, 0.7]
