CSS uses Div to draw a 1 px High Line (ie 6)

Problem:
Div {
Background: # f00;
Height: 1px;
}

<Div> </div>

Purpose: I want to use Div to create a 1 px high line.

* The following ie versions are similar to IE 6.ie7 and Firefox.

At 100px and 1px, FF is normal. However, when the height attribute is smaller than 8 PX, the IE height will remain unchanged. Why do ie know 100px and do not know 1px.
Solution:

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Code
<Style>
Div
{
Background: # f00;
Height: 1px;
Overflow: hidden;
}
</Style>

<Div> </div>

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