@ldebritto – many thanks, footnotes not really an option, since we don’t need them to be visible in the printed version – it is purely intended as an internal “guide” to the reader, as they are navigating the document. The same terms are used over and over again, and so we don’t want the “assistance” to be overly-pronounced, but there on a needs-only basis. As an aside, this is in the academic context, so colleagues would be very familiar with using footnotes – but as mentioned, not really what we are after in this particular case.
@tjluoma Yes, comments are being used now – but we want to use keep them there for a specific purpose (explaining the context/ramifications of a clause/its underlying rationale etc.). So don’t want it to be mixed with what we hoped the tooltips would offer. The Glossary option appears to be closest then to what we will need to use, albeit that it then depends on the underlying link.