When the top and bottom offset properties are applied to the same element, height is implied.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns='http://www.w3.org/1999/xhtml' xml:lang='en'>
<head>
<title>Opposing Offset Properties</title>
<style type='text/css'>
body {
font: 12px sans-serif;
background: lightyellow;
}
div#offset-four {
background: yellow;
border: 1px solid rgb(128, 128, 128);
position: absolute;
top: 20px;
right: 20px;
bottom: 20px;
left: 20px;
}
p {
margin: 0;
padding: 5px;
border: 1px solid black;
}
p#offset-y {
position: absolute;
top: 5px;
right: 5px;
bottom: 5px;
width: 100px;
background: khaki;
}
</style>
</head>
<body>
<div id='offset-four'>
<p id='offset-y'>
When the top and bottom offset properties are applied to the same
element, height is implied.
</p>
</div>
</body>
</html>
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