---
root:
  items:
    - type: stacking-context
      bounds: [0, 0, 1000, 1000]
      items:
        - type: rect
          bounds: [100, 100, 500, 500]
          color: black
        - type: box-shadow
          bounds: [100, 100, 500, 500]
          blur-radius: 20
          clip-mode: inset
          spread-radius: 200
          color: green