2d.composite.globalAlpha.invalid.html (1191B)
1 <!DOCTYPE html> 2 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. --> 3 <meta charset="UTF-8"> 4 <title>Canvas test: 2d.composite.globalAlpha.invalid</title> 5 <script src="/resources/testharness.js"></script> 6 <script src="/resources/testharnessreport.js"></script> 7 <script src="/html/canvas/resources/canvas-tests.js"></script> 8 <link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css"> 9 <body class="show_output"> 10 11 <h1>2d.composite.globalAlpha.invalid</h1> 12 <p class="desc"></p> 13 14 15 <p class="output">Actual output:</p> 16 <canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas> 17 18 <ul id="d"></ul> 19 <script> 20 var t = async_test(""); 21 _addTest(function(canvas, ctx) { 22 23 ctx.globalAlpha = 0.5; 24 // This may not set it to exactly 0.5 if it is rounded/quantised, so 25 // remember for future comparisons. 26 var a = ctx.globalAlpha; 27 ctx.globalAlpha = Infinity; 28 _assertSame(ctx.globalAlpha, a, "ctx.globalAlpha", "a"); 29 ctx.globalAlpha = -Infinity; 30 _assertSame(ctx.globalAlpha, a, "ctx.globalAlpha", "a"); 31 ctx.globalAlpha = NaN; 32 _assertSame(ctx.globalAlpha, a, "ctx.globalAlpha", "a"); 33 34 }); 35 </script>