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Test Info:

<!DOCTYPE html>
<html>
<head>
<title>Bug 1121748-1</title>
<meta charset=utf-8>
<style>
html { width: 25%; }
ul {
margin: 0;
padding: 0;
border: 1px solid green;
}
ul li {
position: relative;
margin: 2px 10px;
background: #eee;
display: block;
}
ul li[hidden] {
display: none;
}
</style>
<script>
function test() {
document.body.dir = 'rtl';
document.querySelector('#test').offsetHeight;
document.querySelector('#test').hidden = false;
}
</script>
</head>
<body onload="test()">
<ul>
<li id="test" hidden> item #1 </li>
<li> item #2 </li>
<li> item #3 </li>
</ul>
</body>
</html>