<!DOCTYPE HTML> <html> <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=775852 --> <head> <meta charset="utf-8"> <title>Test for Bug 775852</title> <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script> <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/> </head> <body> <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=775852">Mozilla Bug 775852</a> <p id="display"></p> <div id="content" style="display: none"> <canvas width="1" height="1" id="c"></canvas> </div> <pre id="test"> <script type="application/javascript"> /** Test for Bug 775852 **/ function doTest() { var gl = $("c").getContext("experimental-webgl"); if (!gl) { // No WebGL support on MacOS 10.5. Just skip this test todo(false, "WebGL not supported"); return; } var setterCalled = false; extLength = gl.getSupportedExtensions().length; ok(extLength > 0, "This test won't work right if we have no supported extensions"); Object.defineProperty(Array.prototype, "0", { set: function(val) { setterCalled = true; } }); // Test that our property got defined correctly var arr = [] arr[0] = 5; is(setterCalled, true, "Setter should be called when setting prop on array"); setterCalled = false; is(gl.getSupportedExtensions().length, extLength, "We should still have the same number of extensions"); is(setterCalled, false, "Setter should not be called when getting supported extensions"); } doTest(); </script> </pre> </body> </html>