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<!DOCTYPE HTML>
<html>
<body>
<canvas id="canvas" width="300" height="300"/>
<script>
var ctx = document.getElementById('canvas').getContext('2d');
var grad = ctx.createLinearGradient(150,0,150,300);
grad.addColorStop(0, 'white');
grad.addColorStop(1, 'black');
ctx.fillStyle = grad;
ctx.fillRect(0,0,300,300);
</script>
</body>
</html>
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