Since Mantano updated their reader to be able to handle ePub 3 last week, I spent the weekend preparing an ePub 3 version. My aim was to reduce the visual clutter produced by the notes, and I think ePub3 allows this to be done fairly well (it's not just for gratuitous multimedia). Footnotes are now handled using the <aside> mechanism and should appear in a popup window for those readers that have implemented a special presentation. Marginal notes are hidden and revealed using css3 animation so they remain in place but don't crowd the text.
In the course of revising the book I came across a few lingering errors that have been corrected. Most of these are very minor formatting changes (i.e. making sure italics are used consistently in the marginal notes). The only correction of any significance is at line 69 of
Mont Blanc, which should read
tracks rather than
tracts (a tract of wolves is probably taking poetic licence too far). The ePub 3 version should therefore be considered the definitive edition. I've tested it in Readium in Chrome and the Mantano app as well as iBooks on a Mac and Azardi (though I can't recommend Azardi because of its font issues). Kobo also supports ePub3, I've not been able to test it on an actual Kobo device, but those with recent Kobo devices like the Aura HD should give it a try.
Regarding accessibility, sections are tagged with the relevant descriptors, and I've set aria-hidden="true" on the line-number and marginal note elements as suggested in the
guidelines, which might prevent screen-readers from mixing them in with the main text. This has no effect on the TTS system in iBooks, but might work on more specialised systems.