<td style="border-color: transparent; border-right-style: hidden;">td without right border</td>
<td style="border-color: transparent; border-left-style: hidden;">td without left border</td>
<td style="border-color: transparent; border-top-style: hidden;">td without top border</td>
<td style="border-color: transparent; border-bottom-style: hidden;">td without bottom border</td>