This is with 6.0r6. The text displays over the next cell and beyond. It still overflows if the white-space: nowrap is removed.
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<style type="text/css">
table.test {
width : 200px;
border-collapse : collapse;
table-layout : fixed;
}
td.long {
overflow : hidden;
white-space : nowrap;
width : 100px;
border : 1px solid black;
}
td.blank {
width : 100px;
border : 1px solid red;
}
</style>
<body>
<table class="test">
<tr>
<td class="long">supercalifriagilisticexpialidocious Test 123</td>
<td class="blank">Next</td>
</tr>
</table>
</body>
</html>