Actually, the CSS rule is applied to a <DIV> tag, which in turn surrounds the <H4> tag in the HTML. This is necessary because IE has problems positioning elements directly. But if you wrap an element in a <DIV> and then position the <DIV>, the element will be positioned fine. That's an excellent general rule to follow when positioning anything.
If your browser doesn't support this CSS property, click here to see what it looks like.