You can try running the following code to draw an oval in HTML5 canvas -
<!DOCTYPE HTML>
<html>
<head>
</head>
<body>
<canvas id="newCanvas" width="450" height="300"></canvas>
<script>
// canvas
var c = document.getElementById('newCanvas');
var context = c.getContext('2d');
var cX = 0;
var cY = 0;
var radius = 40;
context.save();
context.translate(c.width / 2, c.height / 2);
context.scale(2, 1);
context.beginPath();
context.arc(cX, cY, radius, 0, 2 * Math.PI, false);
context.restore();
context.fillStyle = '#000000';
context.fill();
context.lineWidth = 2;
context.strokeStyle = 'yellow';
context.stroke();
</script>
</body>
</html>
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