[html] HTML selected="selected" not working

Hi can somebody tell me what is the wrong in the below code?

Selected="selected" not working for me.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
    <select id="tstselect" name="tstselect" onchange="showselected(this.value);">
    <option value="0" >0</option>
    <option value="1" >1</option>
    <option value="2" >2</option>
    <option value="3" selected="selected">3</option>
    </select>

Thanks in advance

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