I do change ePub 3 to ePub 2. I use Notepad++ or Calibre's editor to do so. It's not difficult to do so. It means the ePub I end up with is more compatible overall. These eBooks do not need any ePub 3 specific features. Making them ePub 3 is silly. It just causes code bloat. i prefer to have the simplest code possible to do the job.
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