HTML :
<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Draw a rectangular shape</title>
</head>
<body onload="draw();">
<canvas id="canvas" width="150" height="150"></canvas>
</body>
</html>
JS :
function draw() {
var canvas = document.getElementById('canvas');
if (canvas.getContext) {
var context = canvas.getContext('2d');
context.fillRect(20,20,100,100);
context.clearRect(40,40,60,60);
context.strokeRect(45,45,50,50);
}
}
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