<!DOCTYPE HTML>
<html>
<head>
<style>
body {
margin: 0px;
padding: 0px;
}
#myCanvas {
border: 2px solid RGB(0, 150, 70);
}
</style>
<script>
window.onload = function() {
var canvas = document.getElementById("myCanvas");
var context = canvas.getContext("2d");
/////////////////////////////////////////////////////
var centerX = 600;
var centerY = 300;
var radius = 50;
context.beginPath();
context.arc(centerX, centerY, radius, 0, 2 * Math.PI, false);
var grd = context.createLinearGradient(550, 250, 650, 350);
grd.addColorStop(0, "#FFFF33");
grd.addColorStop(1, "#0000FF");
context.fillStyle = grd;
context.fill();
context.stroke();
////////////////////////////////////////////////////
};
</script>
</head>
<body>
<canvas id="myCanvas" width="800" height="600"></canvas>
</body>
</html>
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