Quote:
Originally Posted by jackie_w
I think calibre's builtin Polish Update Cover option does make any necessary OPF changes for epub3.
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That and more as it adds properties="calibre:title-page svg".
I prefer Modify Epub as it does more for me than Polish does--I often remove unwanted spans by simply editing the <span class="blahblah"> to <span>, etc. and then let Modify Epub clean up the remnants.
One common reason for this is the body sets a default font size of 1.0em, the paragraph sets a default size of 1.0em and then each covered in red body fluid paragraph has a span with a class that sets font size to 1.0em.