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<canvas id="canvas" width="100" height="100"></canvas>
<script>
var can = document.getElementById('canvas');
var ctx = can.getContext('2d');
ctx.shadowOffsetX = 24;
ctx.shadowOffsetY = 24;
ctx.shadowColor = 'blue';
ctx.shadowBlur = 20;
ctx.rect(0,0,100,50);
ctx.clip();
ctx.fillStyle = 'black';
ctx.fillRect(0,0,40,40);
</script>
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