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I used Calibre to convert my HTML file to EPUB3 and check it with its viewer and I notice that a lot of syles are missing !!!!
so I check the created ebook's files using calibre local editor and what I came up with is all div's class has changed (it add calibre1 to each div or change content-block to content-block1 for example )
so is there any option to ignore those changes?
mean force calibre to import the file without adding any additional class or divs.
Generally to maximize compatibility and robustness, epub converters will strip as much styling out as possible to still maintain formatting, so I would encourage you to just deal with it.
If you absolutely have to keep original styling you can edit the archive using a program like 7zip. Open the archive and find the .css file within. There is probably significant changes made to classes and ids so it may take quite a bit of fiddling.
