Quote:
Originally Posted by Hardboiled
Also a lot of early or badly formed eBooks can even have CSS styling directly within the HTML files.
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That is what I meant. Calibre takes these out of the html files and puts them in the css during the conversion process. That's where those "many css styles" come from. If the book is correctly formatted, there won't be any mess of inline html styles in it and so Calibre won't need to generate additional css entries from them.
I edit all my ebooks too, but in the calibre editor, not in Sigil. And yes, lots of self-published ebooks are a mess.