<!doctype html>
<html>
<head>
  <style type="text/css">
    td {
      border: 1px solid black;
    }
  </style>
</head>
<body>
<table>
  <tr>
    <td>
	 <span style="display: inline-block; width: 50px; height: 10px; background:green;"></span>
	</td>
    <td>
	 <span style="display: inline-block; width: 50px; height: 10px; background:green;"></span>
	</td>
    <td>
	 <span style="display: inline-block; width: 50px; height: 10px; background:green;"></span>
	</td>
  </tr>
</table>
</body>
</html>