Quote:
Originally Posted by maximus83
Book is epub 3, and the Kobo supports epub 3, and renders some of the footnotes as popups as indicated. And it works in most other books, except those where there's a very large set of foot/end notes to render all at one time. So I think epub version is not the issue here, everything is 3, every apps works (except Kobo, which only works part of the time).
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Unless the person who created the book made correct use of the epub3 footnote structure, it is indeed going to be hit and miss. I have looked at ~50 "epub3" ebooks that have footnotes. I don't need to use more than a hand's worth of fingers to count the number where I saw the correct syntax for an epub3 footnote being used never mind being used correctly.
Open the epub in Sigil or calibre's editor and look for code similar to:
Code:
<a href="#footnote1" epub:type="noteref" >1</a>
and
Code:
<aside id="footnote1" epub:type="footnote" >
Footnote text
</aside>
and in the header for the epub file look for the <html> tag where you should see
xmlns:epub="http://www.idpf.org/2007/ops"
Code:
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops" >
You may want to check such site as the Daisy kb for items like
Notes for more information including adding a return link.
And please note that nothing in the epub3 specs requires footnotes to be popups. I have looked through those specs several times and it appears that how to display footnotes is left as an exercise to the programmers of the rendering engine.