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var tests = {};
tests['linear gradients'] = function(ctx){
var lingrad = ctx.createLinearGradient(0,0,0,150);
lingrad.addColorStop(0, '#00ABEB');
lingrad.addColorStop(0.5, '#fff');
lingrad.addColorStop(0.5, '#26C000');
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)');
ctx.fillStyle = lingrad;
ctx.strokeStyle = lingrad2;
ctx.fillRect(10,10,130,130);
ctx.strokeRect(50,50,50,50);
};
tests['global alpha'] = function(ctx){
ctx.globalAlpha = 0.5;
ctx.fillStyle = 'rgba(0,0,0,0.5)';
ctx.strokeRect(0,0,50,50);
ctx.globalAlpha = 0.8;
ctx.fillRect(20,20,20,20);
ctx.fillStyle = 'black';
ctx.globalAlpha = 1;
ctx.fillRect(25,25,10,10);
};