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<!DOCTYPE html>
<html>
<body>
<svg style="display: block; width: 0; height: 0">
<defs>
<filter id="drop-shadow">
<feGaussianBlur in="SourceAlpha" stdDeviation="0"/>
<feOffset dx="0" dy="10" result="offsetblur"/>
<feFlood flood-color="rgba(0,0,0,1)"/>
<feComposite in2="offsetblur" operator="in"/>
<feMerge>
<feMergeNode/>
<feMergeNode in="SourceGraphic"/>
</feMerge>
</filter>
</defs>
</svg>
<script>
var canvas = document.createElement('canvas');
canvas.width = 100;
canvas.height = 100;
var ctx = canvas.getContext('2d');
ctx.filter = 'url(#drop-shadow)';
ctx.fillStyle = '#0f0';
ctx.fillRect(25, 25, 50, 40);
document.body.appendChild(canvas);
</script>
</body>
</html>
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