<!DOCTYPE HTML> <html> <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=1298970 --> <head> <title>Test for Bug 1298970</title> <script type="text/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=1298970">Mozilla Bug 1298970</a> <p id="display"></p> <div id="inner"></div> <script class="testbody" type="text/javascript"> /** Test for Bug 1298970 **/ var target = document.getElementById("inner"); var event = new Event("test", { bubbles: true, cancelable: true }); is(event.cancelBubble, false, "Event.cancelBubble should be false by default"); target.addEventListener("test", (e) => { e.stopPropagation(); is(e.cancelBubble, true, "Event.cancelBubble should be true after stopPropagation"); }, true); target.dispatchEvent(event); </script> </body> </html>