<!DOCTYPE HTML>
<html>
<head>
<style>
body {
margin: 0px;
padding: 0px;
}
#myCanvas {
border: 2px solid rgb(0,255,0);
}
</style>
<script>
window.onload = function() {
var canvas = document.getElementById("myCanvas");
var context = canvas.getContext("2d");
/////////////////////////////////////////
var Xc = 600;
var Yc = 300;
var radius = 50;
var theta = 0;
context.beginPath();
context.arc(Xc, Yc, radius, 0, 2*Math.PI, false);
context.fillStyle = grd;
var grd = context.createLinearGradient(500,300,700,300);
grd.addColorStop(0, "#ffff00");
grd.addColorStop(1, "#0000ff");
context.fillStyle = grd;
context.fill();
context.lineWidth = 0;
context.strokeStyle = none;
context.stroke();
//////////////////////////////////////////
};
</script>
</head>
<body>
<canvas id="myCanvas" width="800" height="600"></canvas>
</body>
</html>

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