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<!DOCTYPE html>
<html>
<body>
<canvas id ="output" width="200" height="100"></canvas>
<script>
var canvas = document.getElementById('output');
var ctx = canvas.getContext('2d');
ctx.shadowColor = 'black';
ctx.shadowOffsetY = 10;
ctx.shadowOffsetX = 10;
ctx.fillStyle = 'green'
ctx.fillRect(10, 10, 50, 50);
ctx.shadowColor = 'blue';
ctx.shadowBlur = 10;
ctx.shadowOffsetX = 5;
ctx.shadowOffsetY = 5;
ctx.fillStyle = 'green';
ctx.fillRect(110, 10, 50, 50);
</script>
</body>
</html>