Quote:
Originally Posted by JSWolf
Can we have a setting in epubveri to say if an ePub3 is backwards compatible enough with ePub2?
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@Kayadelenium EPUBCheck will return a isBackwardCompatible value that is true if EPUBCheck considers a book epub2-compatible.
However, EPUBCheck has rather low standards. AFAIK, it'll consider an epub3 book backwards-compatible als long as it's not a fixed layout book, contains no Javascript and has an .ncx file.
EPUBCheck also used to check for HTML5-only tags but that check was apparently dropped some time ago.
If you decide to create your own version, you might want to add a check for HTML5-only tags in documents other than the NAV doc.
IMHO, at a bare minimum, the following features also should also disqualify a book from being considered epub2-compatible.
- Multiple renditions
- Media overlays
- MathML, unless a fallback was defined.