position: absolute; top: 0; left: 0;
<!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>Absolute Positioning</title>
<style type='text/css'>
body {
background: yellowgreen;
}
p {
margin: 10px 110px;
}
div {
position: absolute;
background: yellow;
padding: 5px;
width: 100px;
height: 100px;
}
div#top-left {
top: 0;
left: 0;
border-right: 1px solid black;
border-bottom: 1px solid black;
}
</style>
</head>
<body>
<div id='top-left'>
Top, Left
</div>
</body>
</html>
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