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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=990340
+-->
+<head>
+ <meta charset="utf-8">
+ <title>Test for Bug 990340</title>
+ <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+ <script type="application/javascript">
+
+ /** Test for Bug 990340 **/
+
+ function testbug990340() {
+ ok(document.querySelector('#bug990340 span').clientHeight < 100,
+ "'height' is in transition")
+ SimpleTest.finish();
+ }
+
+ SimpleTest.waitForExplicitFinish();
+ </script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=990340">Mozilla Bug 990340</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+<style type="text/css">
+
+#bug990340::before {
+ content: ":before";
+}
+
+#bug990340 span {
+ display: inline-block;
+ border:1px solid blue;
+ height: 20px;
+ transition: height 30s;
+}
+
+#bug990340.s span {
+ height: 100px;
+}
+</style>
+<div id="bug990340" style="overflow:scroll">
+ <span>Transition height</span>
+</div>
+</pre>
+
+<script>
+document.body.offsetHeight;
+document.querySelector('#bug990340').className='s';
+testbug990340()
+</script>
+
+</body>
+</html>