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<!DOCTYPE html>
<html>
<body>
<canvas id="canvas" width="100" height="100"></canvas>
<script>
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
ctx.globalAlpha = 0.5;
ctx.fillStyle = '#000';
ctx.fillRect(25, 35, 50, 40);
ctx.fillStyle = '#0f0';
ctx.fillRect(25, 25, 50, 40);
</script>
</body>
</html>
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