Well, I suppose it depends how much lower than 5.5 you want to go - IFRAMEs were introduced in IE3.
IFRAMEs used to be IE-only, but they were adopted as an official tag in HTML4.01. So they work in all the versions of IE that you're likely to see, plus up-to-date versions of other browsers. Notably, they DON'T work in Netscape 4.7 (but then, what does?).
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