Quote:
Originally Posted by chrisridd
It is probably better and/or safer to open the epub directly in something like Sigil, as that knows how epubs fit together and should be saved.
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There's really nothing magical at all in EPUB, a valid EPUB stay valid if you only change its CSSs, they are only a zip archive of cross-referencing (files must keep their name and sub-directory inside the ZIP/EPUB) text files (optionally binary files for fonts, and for xhtml content when DRMed). The only possible problem when removing font-familly attribute is if it references an EPUB embedded font with characters not present in the eReader's fonts.
I tried that myself in many EPUB (public domain without DRM), no problem at all and I can select my favorite font. It's only a problem if you don't know how to edit and write-back a simple text file inside a ZIP archive.