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<body bgcolor="orange">
    <canvas width="300" height="300" id="testcase-canvas" style="display:none"></canvas>
    <canvas width="300" height="300" id="testcase-canvas-dest"></canvas>
  <script>
    const kShadow = "rgba(00%, 0%, 0%, 1)";
    const kTransparent = "rgba(0%, 100%, 100%, 0.5)";

    var cx, g;

    cx = document.getElementById('testcase-canvas').getContext('2d');
    
    cx.fillStyle = kShadow;
    cx.fillRect(100, 50, 150, 50);

    g = cx.createLinearGradient(0, 50, 0, 0);
    g.addColorStop(0, kShadow);
    g.addColorStop(0.2, kTransparent);
    g.addColorStop(1, kTransparent);
    cx.fillStyle = g;
    cx.fillRect(100, 0, 150, 50);

    g = cx.createRadialGradient(100, 100, 50, 100, 100, 100);
    g.addColorStop(0, kShadow);
    g.addColorStop(0.2, kTransparent);
    g.addColorStop(1, kTransparent);
    cx.fillStyle = g;
    cx.beginPath();
    cx.arc(100, 100, 100, Math.PI * 0.5, Math.PI * 1.5);
    cx.fill();
    
    cx2 = document.getElementById('testcase-canvas-dest').getContext('2d');
    // draw a chunk of the gradients from above onto testcase-canvas-dest
    cx2.drawImage(document.getElementById('testcase-canvas'),45,20, 100,20 ,0,0, 100,20);
  </script>

</window>