<!DOCTYPE HTML> <html> <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=803730 --> <head> <meta charset="utf-8"> <title>Test for Bug 803730</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=803730">Mozilla Bug 803730</a> <p id="display"></p> <div id="content" style="display: none"> </div> <pre id="test"> <script type="application/javascript"> /** Test for Bug 803730 **/ var foo = { isNode: function(obj) { return !!(obj instanceof Node); } }; var elem = document.createElement("span"); var trueCount = 0, falseCount = 0; for (var x = 0; x < 100000; x++) { if (foo.isNode(elem)) trueCount++; else falseCount++; } is(falseCount, 0, "elem instanceof Node working correctly."); </script> </pre> </body> </html>