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<body>
<script>
var canvas, ctx;
canvas = document.createElement("canvas");
canvas.width = 100;
canvas.height = 100;
document.body.appendChild(canvas);
ctx = canvas.getContext("2d");
ctx.globalAlpha = 0.5;
ctx.shadowOffsetX = -canvas.width;
ctx.shadowColor = 'red';
ctx.fillRect(canvas.width,0,canvas.width,canvas.height);
</script>
</body>