: Re: Epub 2.0 vs 3.0 This might be judged more of a discussion than a question that can be answered, but bear with me. I began my epub journey with a series of InDesign tutorials that instructed

@Julie

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Epub 3 is designed to be backward compatible. So a epub3 file will almost always render on reading systems which read only epub 2. Whether it will actually look good in a epub2 only reading system is another matter.

My strategy is to save all files as epub3 and then test on various platforms.

Of course, Kindle is another matter but Kindle Previewer accepts epub 3 no problem and the kindle app and kf8 support quite a bit of advanced css.

The big difference between epub2 and epub 3 is css media queries, and most reading systems jumped quickly to support that. (Css media queries let you target css according to device/dimensions; that's a vital feature for today's ebooks). Even Kindle supports css media queries pretty well.

A way to separate them by the way is to use basic css for legacy reading systems (epub2) and then to enclose your more adventurous css within css media queries targeted to specific screensizes for epub 3 friendly reading systems.

To summarize: if you make epub2 files instead of epub3, you won't be able to target your css to different dimensions and sizes for reading systems which are more compatible with epub3. That is a huge disadvantage for me.

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