The following example specifies that only the borders between the rows should be visible:

Edit code and click me	Your Result (Some examples do not work in Google Chrome):
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> </head> <body> <p><b>Note:</b> The rules attribute is not displayed properly in Internet Explorer, Chrome, or Safari.</p> <p>Table with rules="rows":</p> <table rules="rows"> <tr> <th>Month</th> <th>Savings</th> </tr> <tr> <td>January</td> <td>$100</td> </tr> </table> <p>Table with rules="cols":</p> <table rules="cols"> <tr> <th>Month</th> <th>Savings</th> </tr> <tr> <td>January</td> <td>$100</td> </tr> </table> <p>Table with rules="all":</p> <table rules="all"> <tr> <th>Month</th> <th>Savings</th> </tr> <tr> <td>January</td> <td>$100</td> </tr> </table> </body> </html>
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