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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Transitions Test: display:none causes transitioncancel</title>
<meta name="timeout" content="long">
<link rel="author" title="Chris Rebert" href="http://chrisrebert.com">
<link rel="help" href="https://drafts.csswg.org/css-transitions-2/#event-dispatch">
<link rel="help" href="https://lists.w3.org/Archives/Public/www-style/2015Apr/0405.html" data-section-title="AnimationEnd events and display: none">
<meta name="flags" content="dom">
<meta name="assert" content="Making an element display:none; while it has a transition in progress should fire a transitioncancel event.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#a {
height: 100px;
width: 100px;
transition: background-color 2s;
}
.red {
background-color: red;
}
.blue {
background-color: blue;
}
.hidden {
display: none !important;
}
</style>
<script>
async_test(function (t) {
window.addEventListener('load', function () {
var div = document.getElementById('a');
var canceled = false;
var after = false;
div.addEventListener('transitioncancel', function () {
canceled = true;
t.step(function () {
assert_true(true, "transitioncancel event did fire");
});
}, false);
div.className = 'blue';// initiate transition
window.setTimeout(function () {
t.step(function () {
assert_false(canceled, "transitioncancel did not fire before hiding callback ran");
assert_false(after, "hiding callback ran before the end of the test");
});
div.className += ' hidden';// force display:none during the transition
}, 1000);// halfway into the transition
window.setTimeout(function () {
after = true;
t.step(function () {
assert_true(canceled, "transitioncancel event did fire");
t.done();
});
}, 2100);// after the transition would have ended
}, false);
}, "transitioncancel should be fired if the element is made display:none during the transition");
</script>
</head>
<body>
<div id="a" class="red"></div>
</body>
</html>
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