File: 2d.composite.globalAlpha.invalid.html

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<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<meta charset="UTF-8">
<title>Canvas test: 2d.composite.globalAlpha.invalid</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/canvas/resources/canvas-tests.js"></script>
<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
<body class="show_output">

<h1>2d.composite.globalAlpha.invalid</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>

<ul id="d"></ul>
<script>
var t = async_test("");
_addTest(function(canvas, ctx) {

  ctx.globalAlpha = 0.5;
  // This may not set it to exactly 0.5 if it is rounded/quantised, so
  // remember for future comparisons.
  var a = ctx.globalAlpha;
  ctx.globalAlpha = Infinity;
  _assertSame(ctx.globalAlpha, a, "ctx.globalAlpha", "a");
  ctx.globalAlpha = -Infinity;
  _assertSame(ctx.globalAlpha, a, "ctx.globalAlpha", "a");
  ctx.globalAlpha = NaN;
  _assertSame(ctx.globalAlpha, a, "ctx.globalAlpha", "a");

});
</script>