<!DOCTYPE html>
<html>
<head>
<title>Bug 1086883</title>
<!-- 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>