Why won't the vertical margins between <p> and <hr> collapse in IE7

Posted by Nicolas on Stack Overflow See other posts from Stack Overflow or by Nicolas
Published on 2010-05-26T13:03:23Z Indexed on 2010/05/26 13:11 UTC
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Hello all,

Perhaps I am missing something, but I can't explain this from any IE bug I know of. Why in this example do the margins of the <p> and <hr> elements collapse as expected in standards compliant browsers (i.e. FF3, IE8, etc) but not in IE7 (including IE8 compatibility mode)?

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" >
<head>
    <title>IE7 Box Model</title>

    <style type="text/css">

        p {
            border: 1px solid #00f;
            background-color: #fefecb;
            margin: 20x 0 20px 0;
            }

        hr {
            margin: 20px 0 20px 0;
            }

    </style>

</head>
<body>
    <p>
        box 1
    </p>
    <hr />
    <p>
        box 2
    </p>
    <hr />
    <p>
        box 3
    </p>

</body>
</html>

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