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<title>Test for Bug 613888</title>
<script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
<style type="text/css">
#animated-elements-container > span {
color: black;
background: white;
color 10s ease-out,
background 1s ease-out;
#animated-elements-container > span.another {
color: white;
background: black;
<a target="_blank" href="">Mozilla Bug 613888</a>
<pre id="animated-elements-container">
<span should-restyle="true">canceled on a half of the animation</span>
<span should-restyle="true">canceled too fast, and restyled on transitionend</span>
<span>canceled too fast, but not restyled on transitionend</span>
<pre id="test">
<script class="testbody" type="text/javascript">
/** Test for Bug 613888: that we don't cancel transitions when they're
about to end (current interpolated value rounds to ending value) and
they get an unrelated style change. **/
var count_remaining = 6;
window.addEventListener('load', function() {
var cases = Array.from(document.querySelectorAll('#animated-elements-container > span'));
cases.forEach(function(aTarget) {
aTarget.addEventListener('transitionend', function(aEvent) {
if (aTarget.hasAttribute('should-restyle')) = '1px solid';
var attr = 'transitionend-' + aEvent.propertyName;
if (aTarget.hasAttribute(attr)) {
// It's possible, given bad timers, that we might get a
// transition that completed before we reversed it, which could
// lead to two transitionend events for the same thing. We
// don't want to decrement count_remaining in this case.
aTarget.setAttribute(attr, "true");
if (--count_remaining == 0) {
cases.forEach(function(aCase, aIndex) {
"transitionend for color was fired for case "+aIndex);
"transitionend for background-color was fired for case "+aIndex);
cases.forEach(aCase => aCase.className = 'another' );
window.setTimeout(() => cases[0].className = '', 500);
window.setTimeout(() => cases[1].className = cases[2].className = '', 250);