I came across an interesting error message string in Kindle Previewer 3.17:
Quote:
Use an EPUB validator to ensure that the EPUB file is valid and well-formed. Refer to the Formatting Guide for Enhanced Typesetting to see the list of potential epub issues that could cause this failure.
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I have never heard of the "Formatting Guide for Enhanced Typesetting" before. Has anyone else? (A Google search didn't turn up anything.)
Perhaps this is an upcoming supplement to the "Amazon Kindle Publishing Guidelines".