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var ctx = document.getElementById('tutorial').getContext('2d');
// Create gradients
var lingrad = ctx.createLinearGradient(0,0,0,150);
lingrad.addColorStop(0, '#00ABEB');
lingrad.addColorStop(0.5, '#fff');
lingrad.addColorStop(0.5, '#66CC00');
lingrad.addColorStop(1, '#fff');
var lingrad2 = ctx.createLinearGradient(0,50,0,95);
lingrad2.addColorStop(0.5, '#000');
lingrad2.addColorStop(1, 'rgba(0,0,0,0)');
// assign gradients to fill and stroke styles
ctx.fillStyle = lingrad;
ctx.strokeStyle = lingrad2;
// draw shapes
ctx.fillRect(10,10,130,130);
ctx.strokeRect(50,50,50,50);
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