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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>
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