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ſ (Long-S, Medial-S) not showing on iOS in ePub

430 Views 8 Replies Latest reply: Jun 27, 2013 2:48 PM by procrastinator RSS
procrastinator Level 1 Level 1 (0 points)
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Jun 27, 2013 1:31 AM

Hi all,

Yesterday I successfully created an ePub containing a historical novel set in a blackletter font. Font embedding and font display works fine so far, but what isn't working is the "Long-S" (ſ Unicode U+017F)uſed in blackletter and historical texts frequently. Somehow it seems to be mapped to an "end-s" (normal s).

On Mac OS Mountain Lion, showing the "index.html" of the ePub in Safari works fine, however, it even seems to get the ligatures right most of the time.

Any ideas on how to resolve this and get iBooks show the "ſ" correctly?

  • Tom Gewecke Level 9 Level 9 (70,815 points)

    Are you sure the text contains U+017F and is not relying on a typographical variant of normal s?  Is there some way to download the view your .epub?

  • Tom Gewecke Level 9 Level 9 (70,815 points)

    How exactly are you transferring your .epub file to your iOS device?


    Does your .epub file look ok on your non-iOS device using something like Calibre or Adobe Digital Editions?

  • Tom Gewecke Level 9 Level 9 (70,815 points)

    procrastinator wrote:


    it is still surprising that Safari on Mac OS is OK and on iOS it simply shows a standard "s".


    More than surprising!  I don't know of any process by which a hardcoded U+017f could be displayed as a standard "s".  I think it would require some kind of "normalization" to replace characters by their Unicode compatiblity decomposition on the way to the ibooks app.


    iBooks Author automatically embeds fonts, and I have no problem generating a test book that displays this character correctly in iBooks using fonts not present in iOS.


    Have you experimented using any different fonts specified in your css to see if the same thing happens?

  • Tom Gewecke Level 9 Level 9 (70,815 points)

    procrastinator wrote:


    Yes, in the meantime I found out that it could actually be an issue with the font itself.


    Interesting!  I see they have few different types you can choose from



    In my simple test I used a font called UnifrakturMaguntia



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