In this section:
A font must be selected using %fn (Font), before %su (Superscript) is used. All text following %su will be in superscript style. A grave accent (%`su) is used to return to the previous font setting.
For example:
i=winio@('%fn[arial]Einstein said %tsE=MC%su2%`su.',1.8D0)
This is the result of the examples above for %su (Superscript) and %sd (Subscript) used together. In general, scaled down fonts are undesirable as they may become unreadable in lower screen resolutions.