're testing -->
</head><body><div style="float: left; width: 500px; height: 500px">

  <div style="float: right; width: 50px; height: 300px"></div>

  <div style="margin-right: 100px"> <!-- 400px wide -->

    <!-- we're testing the position of this float -->
    <div style="float: left; width: 425px; height: 10px; background: blue"></div>

  </div>

</div>
</body></html>
