root:
  items:
    - type: rect
      bounds: [20, 20, 100, 100]
      color: [0, 128, 0, 1]
    - type: stacking-context
      bounds: [20, 20, 0, 0]
      filters: [opacity(0.5)]
      wraps-backdrop-filter: true
      items:
        - type: backdrop-filter
          bounds: [0, 0, 100, 100]
          filters: [invert(1)]