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<html>
<body>
<canvas width="500" height="500"></canvas>
<script>
var canvas = document.getElementsByTagName('canvas')[0];
var ctx = canvas.getContext('2d');
ctx.fillStyle = "red";
ctx.beginPath();
ctx.rect(250, 250, 50, 50);
ctx.clip();
ctx.fillRect(0,0,500,500);
</script>
</body>
</html>