Quote:
Originally Posted by JSWolf
One thing I've never seen in an ePub 3 is the use the the nav. I've never see it used. With a backwards compatible ePub 3, what programs/apps display the nav?
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None. Epub2 renderers use the ncx. The term "backward compatible Epub3" is misleading. Backward compatibility is inherently built into the epub3 specifications. The epub2 renderer should gracefully fail to display (or play) epub3 content it can't handle--and not blow up spectacularly. It's not the addition of an ncx that makes a text-only epub3 backwad compatible. Adding it just ensures that devices/apps that require one won't go boom.
The commercial epub3s you're mistakenly describing as "epub2s wearing an epub3 suit" are fully blown, spec-compliant epub3s. They've merely had ncxs added to them.