Quote:
Originally Posted by Peter Ahlstrom
Is there any downside whatsoever to removing the NCX and Guide? Such as compatibility with older readers.
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Yes. Compatibility with epub2-only devices is the main reason to leave the ncx/guide in place. Epub2 renderers will display text-only epub3s just fine, so long as the mandatory ncx is in place.
But if the epub3 in question uses a lot of epub3-only features, there's no real reason to try and maintain backward-compatibility.