---
root:
  items:
    - type: stacking-context
      bounds: [0, 0, 100, 100]
      mix-blend-mode: darken
      items:
        - type: gradient
          bounds: [0, 0, 100, 100]
          start: [0, 0]
          end: [0, 100]
          stops: [0.0, [0,0,0,0], 1.0, green]