<!DOCTYPE html>
<html>
<head>
<style>
    body {
        font-family: Ahem;
    }

    .container { 
	    width: 200px; 
	    border-right: 1px solid red;
    }

  .float {
  	width: 80px;
  	height: 80px;
  	float: left;
  }
</style>
</head>
<body>
<div class=container><div class=float></div>ext should wrap at the red border.</div>
</body>
</html>