[css-d] Overflow problem in FF

[Well Damn]

I have a simple div which contains another div filled with lists. 
When the outer div is smaller than the larger div, i'd like it to hide
the text -- not wrap.  The code below works fine in IE, can anyone
suggest what I'm doing wrong for firefox?

<div id="testdiv" style="border:1px solid blue; width:200px; overflow:hidden">
     <div width="100%">
        <ul>
          <li> A test div.A test div.A test div.A test div.A test
div.A test div.A test div.</li>
          <li>  A test div.A test div.A test div.A test div.A test div.A test
div.A test div.</li>
          <li>  A test div.A test div.A test div.A test div.A test div.A test
div.A test div.</li>
          <li>  A test div.A test div.A test div.A test div.A test div.A test
div.A test div.</li>
          <li>  A test div.A test div.A test div.A test div.A test div.A test
div.A test div.</li>
        </ul>
      </div>
</div>
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