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<!DOCTYPE html>
<html>
<head>
<!-- writing mode of #inner div should not affect its position within #outer -->
<style>
#outer {
width:400px;
height:300px;
padding:50px;
border:1px solid black;
}
#inner {
width:200px;
height:100px;
background:red;
}
</style>
</head>
<body>
<div id="outer">
<div id="inner">
</div>
</div>
</body>
</html>