Q:

How to hide the border for specified rows of a table?

I want to hide the border for a specific rows of a table.How to do it?
Any Idea?
 Sample code is Highly Appreciated.

A:

Use the CSS property border on the <td>s following the <tr>s you do not want to have the border. 
In my example I made a class noBorder that I gave to one <tr>. Then I use a simple selector tr.noBorder td to make the border go away for all the <td>s that are inside of <tr>s with the noBorder class by assigning border: 0. 
Note that you do not need to provide the unit (i.e. px) if you set something to 0 as it does not matter anyway. Zero is just zero.

table, tr, td {
  border: 3px solid red;
}
tr.noBorder td {
  border: 0;
}
<table>
  <tr>
    <td>A1</td>
    <td>B1</td>
    <td>C1</td>
  </tr>
  <tr class="noBorder">
    <td>A2</td>
    <td>B2</td>
    <td>C2</td>
  </tr>
  <tr>
    <td>A3</td>
    <td>A3</td>
    <td>A3</td>
  </tr>
</table>

Here's the output as an image:

A:

I use this with good results:
border-style:hidden;

It also works for:
border-right-style:hidden; /*if you want to hide just a border on a cell*/

Example:

<style type="text/css">
      table, th, td {
       border: 2px solid green;
      }
      tr.hide_right > td, td.hide_right{
        border-right-style:hidden;
      }
      tr.hide_all > td, td.hide_all{
        border-style:hidden;
      }
  }
</style>
<table>
  <tr>
    <td class="hide_right">11</td>
    <td>12</td>
    <td class="hide_all">13</td>
  </tr>
  <tr class="hide_right">
    <td>21</td>
    <td>22</td>
    <td>23</td>
  </tr>
  <tr class="hide_all">
    <td>31</td>
    <td>32</td>
    <td>33</td>
  </tr>
</table>

Here is the result:

