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What possible use does an iFrame have for security?

I'm looking at code for an old login form I'm redesigning. It's a simple table with two input fields for username and password.

But just before the end </table> tag there's a blank iFrame which looks like

<iframe style="height:0px;width:0px;visibility:hidden" src="about:blank">This is a security measure.</iframe>

What possible security measures could this provide? I can't think of any and can't ask the guy who put it there in the first place.