Although not perfect and depending on your use case and how you generate your HTML you can do something like this.
HTML
<table id="main">
<tr>
<td class="first"> what are the possible values?</td>
<td rowspan="2">
<div class="rest">
<table>
<tr>
<td>100</td>
<td>200</td>
<td>300</td>
<td>400</td>
<td>500</td>
<td>600</td>
<td>700</td>
<td>800</td>
<td>900</td>
<td>1000</td>
<td>1100</td>
</tr>
<tr>
<td>100</td>
<td>200</td>
<td>300</td>
<td>400</td>
<td>500</td>
<td>600</td>
<td>700</td>
<td>800</td>
<td>900</td>
<td>1000</td>
<td>1100</td>
</tr>
</table>
</div>
</td>
</tr>
<tr class="first_column">
<td class="first"> what are the possible values?</td>
</tr>
</table>
CSS
table {
border-collapse: collapse;
}
table#main {
border-top: 1px solid #DFDFDF;
margin-bottom: 1em;
width:400px;
display: block;
}
table#main .first {
width:200px;
white-space: nowrap;
}
table#main .rest {
overflow: scroll;
background: silver;
width:200px;
}
table td.first, table .rest td {
line-height: 1.5em;
padding: 0.5em 0.6em;
text-align: left;
vertical-align: middle;
text-align: left;
}
PS I only tested this on Safari 6 and Firefox 12, 13 & 14 on OSX