Thread: Forma Best format from Standardebooks.org for Forma: their kepub or their epub3?
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Old 03-27-2020, 07:28 PM   #20
davidfor
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Quote:
Originally Posted by JSWolf View Post
The ePub3 is missing the NCX ToC. That's why the ToC isn't working. Have you tried converting the ePub3 to KePub and seeing if the ToC works?
You are missing the point. An ePub3 is supposed to have the ToC as a navigation document. For ePub3, the NCX version is optional and only supposed to be used for backwards compatibility with reading systems that do not support ePub3. Anything that claims to be an ePub3 reader, should use the navigation document and should not throw any errors if an NCX version is not included.

And for the record, I just created an ePub3 with only the navigation document. I put it on my Aura H2O (only because it was in reach) running firmware 4.20.14622 as both an epub and an kepub. With both, the ToC worked with no issues. All entries were shown and the navigation worked.
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