Where are you seeing this suer agent stylesheet exactly? Post a screenshot. calibre does not add anything to an EPUB while editing it.
EDIT: If you mean the default styling for elements that have no CSS applied, that is present in all EPUB readers, and its contents vary from reader to reader. It is not inserted into the EPUB, but is instead a property of the reader software. Whenever a HTML renderer encounters an HTML element with no styling applied, its basic style properties are taken from the suer agent stylesheet.
Last edited by kovidgoyal; 12-26-2014 at 11:01 PM.
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