| <!DOCTYPE html> |
| <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. --> |
| <title>OffscreenCanvas 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> |
| |
| <h1>2d.composite.globalAlpha.invalid</h1> |
| <p class="desc"></p> |
| |
| |
| <script> |
| var t = async_test(""); |
| var t_pass = t.done.bind(t); |
| var t_fail = t.step_func(function(reason) { |
| throw reason; |
| }); |
| t.step(function() { |
| |
| var offscreenCanvas = new OffscreenCanvas(100, 50); |
| var ctx = offscreenCanvas.getContext('2d'); |
| |
| ctx.globalAlpha = 0.5; |
| var a = ctx.globalAlpha; // might not be exactly 0.5, if it is rounded/quantised, so remember for future comparisons |
| 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"); |
| t.done(); |
| |
| }); |
| </script> |
