<!DOCTYPE HTML> <title>Canvas test: 2d.composite.transparent.lighter</title> <script src="/tests/SimpleTest/SimpleTest.js"></script> <link rel="stylesheet" href="/tests/SimpleTest/test.css"> <body> <canvas id="c" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas> <script> function isPixel(ctx, x,y, r,g,b,a, pos, colour, d) { var pixel = ctx.getImageData(x, y, 1, 1); var pr = pixel.data[0], pg = pixel.data[1], pb = pixel.data[2], pa = pixel.data[3]; ok(r-d <= pr && pr <= r+d && g-d <= pg && pg <= g+d && b-d <= pb && pb <= b+d && a-d <= pa && pa <= a+d, "pixel "+pos+" is "+pr+","+pg+","+pb+","+pa+"; expected "+colour+" +/- "+d); } SimpleTest.waitForExplicitFinish(); addLoadEvent(function () { var canvas = document.getElementById('c'); var ctx = canvas.getContext('2d'); ctx.fillStyle = 'rgba(0, 255, 0, 0.5)'; ctx.fillRect(0, 0, 100, 50); ctx.globalCompositeOperation = 'lighter'; ctx.fillStyle = 'rgba(0, 0, 255, 0.75)'; ctx.fillRect(0, 0, 100, 50); isPixel(ctx, 50,25, 0,127,191,255, "50,25", "0,127,191,255", 5); SimpleTest.finish(); }); </script>