: Re: Can EPUB 3.0 be viewed on EPUB 2 devices This prior question is about the differences between EPUB 2 and EPUB 3. What is more interesting to me, as an owner of three different EPUB 2 devices,

@Lorraine

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The IDPF states the following in a thread about EPUB 3 Rendering in EPUB 2 reading systems

Although EPUB 3 is not perfectly backwards compatible with EPUB 2, a goal of the recent revision was to ensure, as much as possible, a basic level of rendering when features overlap.

The thread particularly mentions that providing the NCX data is necessary, which has been superseded with EPUB Navigation Documents
as described in the EPUB 3 changes document

So, if some care is taken, EPUB 3 files can be made to render on EPUB 2 reading systems.

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