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<html>
<body>
<canvas width="500" height="500"></canvas>
<script>
var canvas = document.getElementsByTagName('canvas')[0];
var ctx = canvas.getContext('2d');
var lineargradient = ctx.createLinearGradient(000,000,500,500);
lineargradient.addColorStop(0,'red');
lineargradient.addColorStop(1,'black');
ctx.fillStyle = lineargradient;
ctx.beginPath();
ctx.rect(00, 00, 250, 250);
ctx.fill();
</script>
</body>
</html>