Also: whether or not your ePub3 is "fully" backward compatible with epub2 renderers or not will depend heavily on the epub2 renderer itself (and the markup/css you've chosen to include in your ePub).
EDIT: yes, I see now that those changes will survive a Sigil change (just not a validation). So perhaps it will work for your wish to submit epubs to iBooks that use a nav document.
Last edited by DiapDealer; 07-25-2014 at 11:55 AM.
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