When click select tag why IE does not deselect text in input

Question

I have a input text and a select tag in HTML. I input something in input tag and select text, but when I click select tag to select something, IE does not deselect text in input tag. Is this IE's specification? Can I use JavaScript to deselect text in input tag?

<input type="text" />
<br>
<select>
<option>aaaaa</option>
<option>bbbbb</option>
<option>ccccc</option>
<option>ddddd</option>
</select>

Answer 1

Found a solution.

window.document.onmousedown = mousedownControl;
function mousedownControl(e) {
    e = window.event;
    if (e.srcElement.nodeName == "SELECT") {
        document.selection.empty();
    }
}