Example:

Header 1	Header 2	Header 3
Cell 1	Cell 2	Cell 3
Code:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
        "http://www.w3.org/TR/html4/loose.dtd">
<html>

<head>
  <title>Context CSS Example</title>
  <meta http-equiv="Content-Type"
        content="text/html; charset=us-ascii">
<style type="text/css"><!--

table.border1 {
    border-top    : 1px solid black;
    border-left   : 1px solid black;
    border-bottom : 0;
    border-right  : 0;
}

table.border1 tr th {
    border-top    : 0;
    border-left   : 0;
    border-bottom : 1px solid black;
    border-right  : 1px solid black;
}

table.border1 tr td {
    border-top    : 0;
    border-left   : 0;
    border-bottom : 1px solid black;
    border-right  : 1px solid black;
}

//-->
</style>

</head>

<body>

<table class='border1' cellspacing='0' cellpadding='2'>
<tr>
  <th>Header 1</th>
  <th>Header 2</th>
  <th>Header 3</th>
</tr>

<tr>
  <td>Cell 1</td>
  <td>Cell 2</td>
  <td>Cell 3</td>
</tr>

</table>

</body>

</html>