layout/tables/reftests/dynamic-text-overflow-table-cell.html

<!DOCTYPE html>
<html class="reftest-wait">
  <table style="table-layout: fixed; width: 130px">
    <tr>
      <td style="overflow: hidden; white-space: nowrap;">
        Some long text that cannot possibly fit in 130 px, because it just can't.
      </td>
    </tr>
  </table>
  <script>
    onload = function() {
      var td = document.querySelector("td");
      // Make sure layout has happened.
      var width = td.offsetWidth;
      td.style.textOverflow = "ellipsis";
      document.documentElement.className = "";
    }
  </script>
</html>