<! DOCTYPE html>
<html>
<head>
</head>
<body onload="document.getElementById('d').style.margin = '60%';">
  <div style="display: table-caption;">
    <div id="d" >
      a
      b
      <span style="float: left;">c</span>
      <span style="float: left;">d</span>
    </div>
  </div>
</body>
</html>
