Word-wrap in an HTML table

The following works for me in Internet Explorer. Note the addition of the table-layout:fixed CSS attribute

td {
  border: 1px solid;
}
<table style="table-layout: fixed; width: 100%">
  <tr>
    <td style="word-wrap: break-word">
      LongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongLongWord
    </td>
  </tr>
</table>

<td style="word-break:break-all;">longtextwithoutspace</td>

or

<span style="word-break:break-all;">longtextwithoutspace</span>

A long shot, but double-check with Firebug (or similar) that you aren't accidentally inheriting the following rule:

white-space:nowrap;

This may override your specified line break behaviour.