<!doctype html>
<html>
<head>
<style type="text/css">
div {
 display: table;
}
div div {
 float: left;
 width: 200px;
 border: 2px solid #000;
}
</style>
</head>
<body>
<div>
 <div>First float</div>
 <script type="text/javascript">b=document.body.offsetHeight;</script>
 <div>Second float</div>
</div>
</body>
</html>