<!DOCTYPE html>
<html>
<body>
<div style="width: 200px; height: 200px;">
    <div style="width: 10px; height: 10px;"></div>
    <div style="float: left; width: 20px; height: 20px;">
    <div style="width: 10px; height: 10px;"></div>
</div>
</body>
</html>