<!DOCTYPE HTML> <html> <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=814064 --> <head> <meta charset="utf-8"> <title>Test for Bug 814064</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=814064">Mozilla Bug 814064</a> <p id="display"></p> <div id="content" style="display: none"> </div> <pre id="test"> <script type="application/javascript"> /** Test for Bug 814064 **/ var xhr = new XMLHttpRequest(); var firings = 0; function readyStateHandler() { is(xhr.readyState, XMLHttpRequest.OPENED, "Should be in OPENED state"); ++firings; } xhr.onreadystatechange = readyStateHandler; xhr.open("GET", ""); is(firings, 1, "Should have fired the readystatechange handler"); xhr.send(); is(firings, 1, "Should not have fired the readystatechange handler"); xhr.onreadystatechange = null; xhr.abort(); is(firings, 1, "Should not have fired the handler no-longer-registered handler"); </script> </pre> </body> </html>