Most scientific papers use cross references to refer to equations or bibliography items across the document. If cross references are widely used in large documents, going back and forth each time to look for the correct page can be a burden; hyperref can take you there, but there's no shortcut to go back to the reading point. It would be much better if hovering the reference hyperlink triggered a popup to show the referred equation/citation/whatever in a floating, minimal window [I'm thinking of something similar to wikipedia footnotes]. This feature could be toggled by pressing Ctrl or another control key, in order to avoid annoying unwanted popups. Reproducible: Always
Actually, there is a documented menu item (Go -> Back/Forward) and shortcut for this (Alt+Shift+Left/Right arrow, can be configured). http://docs.kde.org/stable/en/kdegraphics/okular/navigating.html Is this what you want?
Mmm, the Go -> Back/Forward feature is nice and I apologize for not having noticed it earlier, this is not what I was talking about, but actually is a nice solution to my issue. What I originally asked in my feature request was this: suppose in a document I have equation 1 on page 3, then on page 10 a reference to eq 1 [which typically is highlighted with some color if the latex code was compiled with hyperref]. Instead of going back and forth between pages 10 and 3 [which is not that painful with the feature you just suggested] I'd like to hover the reference "eq 1" on page 10 and having a small rectangle appear next to the reference showing equation 1 for an instant review of that equation. The same idea could apply to footnotes, bibliography items, etcetera.
I would be very interesting in this feature too. It is sort of hard to read a (very?) non-linear document by clicking pages and then going back to the previous document position. It’s too easy to lose track of where you were before the link − be it a figure, reference, footnote, etc. I think this feature made navigating wikipedia a much better experience, they call them “navigation popups”: https://en.wikipedia.org/wiki/Wikipedia:Tools/Navigation_popups I think that the ways this would work is on hovering links that point to inside the document (either with an option enabled or some shortcut), a small popup would open to show the link destination. Would this be implementable as a plugin, or are those only used for supporting different file types? Would a patch going in this direction be appreciated, or is this feature too niche?