<!DOCTYPE HTML> <html> <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=985988 --> <head> <meta charset="utf-8"> <title>Test for Bug 985988</title> <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script> <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/> <script type="application/javascript"> /** Test for Bug 985988 **/ function handler() { return false; } function reversedHandler() { return true; } function test() { var t = document.getElementById("testtarget"); t.onclick = handler; var e = new MouseEvent("click", {cancelable: true}); t.dispatchEvent(e); ok(e.defaultPrevented, "Should have prevented default handling."); t.onclick = reversedHandler; e = new MouseEvent("click", {cancelable: true}); t.dispatchEvent(e); ok(!e.defaultPrevented, "Shouldn't have prevented default handling."); // mouseover has reversed meaning for handler return value. t.onmouseover = reversedHandler; e = new MouseEvent("mouseover", {cancelable: true}); t.dispatchEvent(e); ok(e.defaultPrevented, "Should have prevented default handling."); t.onmouseover = handler; e = new MouseEvent("mouseover", {cancelable: true}); t.dispatchEvent(e); ok(!e.defaultPrevented, "Shouldn't have prevented default handling."); // error has reversed meaning for handler return value. t.onerror = reversedHandler; e = new ErrorEvent("error", {cancelable: true}); t.dispatchEvent(e); ok(e.defaultPrevented, "Should have prevented default handling."); t.onerror = handler; e = new MouseEvent("error", {cancelable: true}); t.dispatchEvent(e); ok(!e.defaultPrevented, "Shouldn't have prevented default handling."); SimpleTest.finish(); } SimpleTest.waitForExplicitFinish(); addLoadEvent(test); </script> </head> <body onload="test()"> <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=985988">Mozilla Bug 985988</a> <p id="display"></p> <div id="content" style="display: none"> </div> <a href="#" id="testtarget">test target</a> <pre id="test"> </pre> </body> </html>