<!DOCTYPE html>
<html>
<head></head>
<body>
<canvas id="mycanvas" width="300" height="300"></canvas>
<script>
var canvas = document.getElementById('mycanvas');
var ctx = canvas.getContext('2d');

ctx.fillStyle = '#0f0';
ctx.fillRect(0, 0, canvas.width, canvas.height);
ctx.lineJoin = 'bevel';
ctx.lineWidth = 12;
ctx.beginPath();
ctx.ellipse(200, 150, 40, 80, -Math.PI / 6, Math.PI / 2, -Math.PI / 2, false);
ctx.ellipse(100, 150, 40, 80, Math.PI / 6, Math.PI / 2, -Math.PI / 2, false);
ctx.stroke();
</script>
</body>
</html>