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<!docytpe html>
<html>
<head>
<meta charset="UTF-8" />
<script>
window.onload=function(){
var c=document.getElementById("myCanvas").getContext("2d");
c.fillStyle = "green";
c.fillRect(0, 0,100,100);
c.fillStyle = "red";
c.globalCompositeOperation = "destination-over";
c.rect(0, 0, 100, 100);
c.clip();
c.fillRect(0, 0, 100, 100);
}
</script>
</head>
<body>
<canvas id="myCanvas" height=50 width=100></canvas>
</body>
</html>
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