Iframes were a non-standard IE-only feature that also had accessibility issues and obviously wouldn't work in Netscape. They were very handy for a variety of s

Iframes were a non-standard IE-only feature that also had accessibility issues and obviously wouldn't work in Netscape. They were very handy for a variety of scenarios so it became part of the spec, but I think most self-respecting web developers avoided them out of principle.