Just run the above plugin cleaner on your epub. Then have a look at the difference in the html code and stylesheet. The plugin is reasonably thorough. I would also make sure to run Doitsu's Epubcheck plugin(another Sigil plugin) after the clean-out to ensure that you have an IDPF-validated and usable epub with no other problems.
Last edited by slowsmile; 02-25-2019 at 09:20 PM.
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