<!DOCTYPE HTML> <html> <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=656954 --> <head> <title>Test for Bug 656954</title> <script 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=656954">Mozilla Bug 656954</a> <p id="display"></p> <div id="content" style="display: none"> </div> <pre id="test"> <script type="application/javascript"> /** Test for Bug 656954 **/ var e = document.createEvent("Event"); is(e.defaultPrevented, false, "After creating event defaultPrevented should be false"); e.initEvent("foo", true, true); var el = document.createElement("div"); el.addEventListener("foo", function(evt) { evt.preventDefault(); }); el.dispatchEvent(e); is(e.defaultPrevented, true, "preventDefault() should have been called!"); e = document.createEvent("Event"); e.initEvent("foo", true, false); el.dispatchEvent(e); is(e.defaultPrevented, false, "preventDefault() should not have any effect!"); </script> </pre> </body> </html>