layout/style/test/test_transitions_bug537151.html

<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=537151
-->
<head>
  <title>Test for Bug 537151</title>
  <script 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);
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>