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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script>
function draw() {
var c = document.getElementById('c').getContext('2d');
c.fillStyle = 'lime';
c.fillRect(0, 0, 100, 50);
c.fillStyle = 'red';
c.fillRect(40, 0, 30, 50);
c.fillStyle = 'blue';
c.fillRect(70, 0, 30, 50);
}
</script>
</head>
<body onload="draw();">
<canvas id='c' width='100' height='50'></canvas>
</body>
</html>