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Originally Posted by Ghitulescu
I wonder whether it is possible to implement a sort of history.back(-1) in an ePub, as not all eReaders allow such a functionality?
This would allow me to simplify multiple references to a single note (then, of course, the return to the right passage).
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All the good ereader software already has a back button, there is no need to duplicate the functionality in HTML.
And there is absolutely no support in the EPUB spec for any such functionality, on the assumption I guess that there is no need
but of course any ereader that uses a web engine for rendering will support it anyway. Which means a bare handful of ereaders (i.e. a subset of smartphone/tablet apps) will support it, and it will break everywhere else.
Why not trust the ereader to do its job?
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Second:
Is there any possibility of a "status line", displaying the page number and other infos, or a frame, that would of course keep account of resizing and screen sizes?
Yes, I know ePub has no pages, but the eReaders do 
I could not find any info concerning the two.
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Once again, that is the job of the ereader itself.
Not only is it impossible to do in HTML, it is also the kind of thing that some people will like and some people will hate, so it needs to be able to be disabled.