Quote:
Originally Posted by JSWolf
But, one of the features of ePub3 is backward compatibility with ePub2 viewers.
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Although backward compatibility is certainly a goal of epub3, it's by no means perfect, nor magically inherent. The onus still lies heavily on the creator to choose to
build a backwardly compatible epub3. It is certainly possible to create an epub3 (that validates perfectly) whose features will not degrade gracefully in an epub2 viewer--and will in fact blow it up.
Sigil could certainly help (behind the scenes) in keeping things compatible, but it's not as simple as "just build it as epub3 and it will still work in epub2-only readers."
And if a decision was made for Sigil to ONLY build epub3s that were completely backward compatible in every way ... there'd be little point in supporting epub3 in the first place (except maybe as a transitional step toward full epub3 support).