This is supposed to be available in HTML4 via the OBJECT tag. However, nearly no browser supports OBJECT fully and properly for this to work well; in addition, unlike SSI which is put into the document before parsing, OBJECT would pull in the document during parsing and the 'environment' would not necessarily be carried over to it, thus making something things such as JavaScripts that span both document sets to fail (maybe not that bad of a thing, but still ....)

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Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain