---
root:
  items:
    - type: rect
      bounds: [10, 10, 130, 130]
      color: [255, 255, 0]
    - type: stacking-context
      bounds: [10, 10, 130, 130]
      items:
        - type: rect
          bounds: [0, 0, 100, 100]
          color: [0, 255, 0]
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          items:
            - type: rect
              bounds: [0, 0, 100, 100]
              color: [255, 0, 0]
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              color: [0, 0, 0]