<!DOCTYPE HTML> <html> <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=748983 --> <head> <meta charset="utf-8"> <title>Test for Bug 748983</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=748983">Mozilla Bug 748983</a> <p id="display"></p> <div id="content" style="display: none"> </div> <pre id="test"> <script type="application/javascript"> /** Test for Bug 748983 **/ SimpleTest.waitForExplicitFinish(); function runTest() { ok(document instanceof EventTarget, "document is an event target") ok(new XMLHttpRequest() instanceof XMLHttpRequest, "instanceof should work on XHR"); ok(HTMLElement.prototype instanceof Node, "instanceof needs to walk the prototype chain") var otherWin = document.getElementById("testFrame").contentWindow; ok(otherWin.HTMLElement.prototype instanceof otherWin.Node, "Same-origin instanceof of a interface prototype object should work, even if called cross-origin"); ok(!(otherWin.HTMLElement.prototype instanceof Node), "Cross-origin instanceof of a interface prototype object shouldn't work"); // We need to reset HTMLElement.prototype.__proto__ to the original value // before using anything from the harness, otherwise the harness code breaks // in weird ways. HTMLElement.prototype.__proto__ = otherWin.Element.prototype; var [ shouldSucceed, shouldFail ] = otherWin.runTest(); shouldSucceed = shouldSucceed && HTMLElement.prototype instanceof otherWin.Element; shouldFail = shouldFail && HTMLElement.prototype instanceof Element; HTMLElement.prototype.__proto__ = Element.prototype; ok(shouldSucceed, "If an interface prototype object is on the protochain then instanceof with the interface object should succeed"); ok(!shouldFail, "If an interface prototype object is not on the protochain then instanceof with the interface object should succeed"); SimpleTest.finish(); } </script> </pre> <iframe id="testFrame" src="file_InstanceOf.html" onload="runTest()"></iframe> </body> </html>