https://github.com/web-platform-tests/wpt
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2d.gradient.interpolate.colouralpha.html
<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by tools/gentest.py. -->
<title>Canvas test: 2d.gradient.interpolate.colouralpha</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/canvas-tests.js"></script>
<link rel="stylesheet" href="/common/canvas-tests.css">
<body class="show_output">

<h1>2d.gradient.interpolate.colouralpha</h1>
<p class="desc"></p>


<p class="output">Actual output:</p>
<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
<p class="output expectedtext">Expected output:<p><img src="2d.gradient.interpolate.colouralpha.png" class="output expected" id="expected" alt="">
<ul id="d"></ul>
<script>
var t = async_test("");
_addTest(function(canvas, ctx) {

var g = ctx.createLinearGradient(0, 0, 100, 0);
g.addColorStop(0, 'rgba(255,255,0, 0)');
g.addColorStop(1, 'rgba(0,0,255, 1)');
ctx.fillStyle = g;
ctx.fillRect(0, 0, 100, 50);
_assertPixelApprox(canvas, 25,25, 190,190,65,65, "25,25", "190,190,65,65", 3);
_assertPixelApprox(canvas, 50,25, 126,126,128,128, "50,25", "126,126,128,128", 3);
_assertPixelApprox(canvas, 75,25, 62,62,192,192, "75,25", "62,62,192,192", 3);


});
</script>

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