<!DOCTYPE HTML> <html> <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=537151 --> <head> <title>Test for Bug 537151</title> <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script> <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/> <style type="text/css"> #display { transition: margin-left 200ms; } </style> </head> <body> <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=537151">Mozilla Bug 537151</a> <p id="display">Paragraph</p> <pre id="test"> <script type="application/javascript"> /** Test for Bug 537151 **/ SimpleTest.waitForExplicitFinish(); SimpleTest.requestFlakyTimeout("untriaged"); var p = document.getElementById("display"); p.addEventListener("transitionend", listener, false); var ignored = getComputedStyle(p, "").marginLeft; p.style.marginLeft = "150px"; var event_count = 0; function listener(event) { ++event_count; setTimeout(finish, 400); p.style.color = "blue"; } function finish() { is(event_count, 1, "should have gotten only 1 transitionend event"); SimpleTest.finish(); } </script> </pre> </body> </html>