You can only apply border-radius to td, not tr or table. I’ve gotten around this for rounded corner tables by using these styles:
table {
border-collapse: separate;
border-spacing: 0;
}
td {
border: solid 1px #000;
border-style: none solid solid none;
padding: 10px;
}
tr:first-child td:first-child { border-top-left-radius: 10px; }
tr:first-child td:last-child { border-top-right-radius: 10px; }
tr:last-child td:first-child { border-bottom-left-radius: 10px; }
tr:last-child td:last-child { border-bottom-right-radius: 10px; }
tr:first-child td { border-top-style: solid; }
tr td:first-child { border-left-style: solid; }
<table>
<tr>
<td>1.1</td>
<td>1.2</td>
<td>1.3</td>
</tr>
<tr>
<td>2.1</td>
<td>2.2</td>
<td>2.3</td>
</tr>
<tr>
<td>3.1</td>
<td>3.2</td>
<td>3.3</td>
</tr>
</table>
Be sure to provide all the vendor prefixes. You can see it in action on JSFiddle too.