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<body>
<canvas id="canvas" width="300" height="300"></canvas>
</body>
<script>
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
ctx.filter = 'blur(2px)';
ctx.fillStyle = 'yellow';
ctx.fillRect(10,10,100,100);
ctx.filter = 'blur(5px)';
ctx.fillStyle = 'magenta';
ctx.fillRect(120, 10, 100, 100);
ctx.filter = 'blur(5px) blur(10px)';
ctx.fillStyle = 'cyan';
ctx.fillRect(10, 120, 100, 100);
ctx.filter = 'none';
ctx.fillStyle = 'black';
ctx.fillRect(120, 120, 100, 100);
</script>