iBooks/epub3 will do popup footnotes, if you mark up the document just right. For more info see: http://www.pigsgourdsandwikis.com/2012/05/creating-pop-up-footn

iBooks/epub3 will do popup footnotes, if you mark up the document just right. For more info see: http://www.pigsgourdsandwikis.com/2012/05/creating-pop-up-footnotes-in-epub-3-and.html http://www.pigsgourdsandwikis.com/2012/05/creating-pop-up-fo... The blog article doesn't mention it, but I've found that the footnotes have to be in the same XHTML file as the reference for this to work in iBooks. Also, iBooks for OSX doesn't display these popup footnotes yet.