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epub validation question
A friend wrote a book using Scrivener, and sent it to me to check out.
First thing I do is add it to Calibre and use the "Edit Book" function to look for errors and issues. It found a lot of issues, e.g. unexpected empty blocks, blockquotes in the wrong order, duplicate selectors, 166 unused classes, unused CSS styles, etc., yet he had no problems shown in Scrivener.
I uploaded it to an .epub validator site, and it found only one obscure issue.
My question is why can Calibre find all these issues that authoring tools and validator sites miss?
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