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| 1 <!DOCTYPE html> |
| 2 <!-- DO NOT EDIT! This test has been generated by tools/gentest.py. --> |
| 3 <title>OffscreenCanvas test: 2d.composite.globalAlpha.invalid</title> |
| 4 <script src="/resources/testharness.js"></script> |
| 5 <script src="/resources/testharnessreport.js"></script> |
| 6 <script src="/common/canvas-tests.js"></script> |
| 7 |
| 8 <h1>2d.composite.globalAlpha.invalid</h1> |
| 9 <p class="desc"></p> |
| 10 |
| 11 |
| 12 <script> |
| 13 var t = async_test(""); |
| 14 t.step(function() { |
| 15 |
| 16 var offscreenCanvas = new OffscreenCanvas(100, 50); |
| 17 var ctx = offscreenCanvas.getContext('2d'); |
| 18 |
| 19 ctx.globalAlpha = 0.5; |
| 20 var a = ctx.globalAlpha; // might not be exactly 0.5, if it is rounded/quantised
, so remember for future comparisons |
| 21 ctx.globalAlpha = Infinity; |
| 22 _assertSame(ctx.globalAlpha, a, "ctx.globalAlpha", "a"); |
| 23 ctx.globalAlpha = -Infinity; |
| 24 _assertSame(ctx.globalAlpha, a, "ctx.globalAlpha", "a"); |
| 25 ctx.globalAlpha = NaN; |
| 26 _assertSame(ctx.globalAlpha, a, "ctx.globalAlpha", "a"); |
| 27 |
| 28 t.done(); |
| 29 |
| 30 }); |
| 31 </script> |
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