Quote:
Originally Posted by DNSB
For me, I see no real benefit to converting an epub2 to an epub3. Creating an epub3 does offer advanced features including the accessibility ones. In theory, any epub3 features should be treated as no-ops by an epub2 renderer.
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For some arguments, see JSWolf's 2017 topic:
"Why ePub 3?"
DiapDealer and KevinH explain a lot of the EPUB3 advantages, and has been explaining it for years and years.
And JSWolf has been stubbornly insisting EPUB2 is the be all end all final and only way, his way or the highway.
Personally, I still stick with EPUB2, but I see no harms if you code your EPUB3 with EPUB2 fallbacks. (Or EPUB2 with some slight EPUB3-compatible CSS/semantics/enhancements.)