Think you are out of luck in the case of epub2; position:fixed is not in the spec, and I've never seen an epubreader that supports it. Not sure about KF8 and what it can handle, but I know from experience that it doesn't like position:absolute, so it seems unlikely it accepts position:fixed. I've never looked into KF8 fixed-layout and if there is a possibility of making a semi-fixed layout book.
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