Hi, I'm writing an ebook template with Sigil and I'd like it could be a backward compatible epub 3 file.
Is it enough change the following things?
- put version="3.0" instead of 2.0 inside <package>
- insert a Navigation document
- indicate cover in <manifest>: <item id="cover-image" properties="cover-image" href="Images/front_cover.jpg" media-type="image/jpeg"/>
- add “dc:terms modified” metadata
something else? should be this fully compatible with old ereaders?
