unexpected margin with very simple html

Posted by Serhat Özgel on Stack Overflow See other posts from Stack Overflow or by Serhat Özgel
Published on 2008-11-24T22:32:18Z Indexed on 2010/05/31 2:42 UTC
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I have a very simple html. The red div is inside the blue div and has a 10 px top margin. On non-ie browsers, the blue box is 10 px apart from the top of viewport and the red div is at the very top of the blue div. What I expect is the ie behavior: red div must be 10 px apart from the top of the blue div. Why does non-ie browsers render like this? (I suppose the wrong behavior is the IE's but why?)

And, what is the correct way to do this?

why blank?

<html>
<head>
<style>
body { margin:0; padding:0; }
.outer
{
    background-color: #00f;
    height: 50px;    
}
.inner
{
    height: 20px;
    width: 20px;
    background-color: #f00;
    margin: 10px 0 0 10px;
}
</style>
</head>
<body>
<div class="outer">
    <div class="inner">
    </div>
</div>
</body>
</html>

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