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<!doctype html>
<html>
<head>
<style type="text/css">
fieldset {
margin: 0; padding: 0;
border: none;
}
#float {
float: left;
width: 10em; height: 5em;
background-color: green;
}
#sibling {
width: 5em; height: 10em;
background-color: blue;
}
</style>
</head>
<body>
<fieldset>
<div id="float"></div>
<div id="sibling"></div>
</fieldset>
</body>
</html>