Quote:
Originally Posted by kovidgoyal
calibre only inserts a class on html if there are some styles applied to html in the input document.
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Ahh yes, I see it now. The root tag is included in the styles of the input document; just to set 0 margin/padding.
I removed 'html' from this styling, and the resulting EPUB validated perfectly.
Just in case others find this, I was using an html template created by Guido Henkel (a v. similar one is used by David Gaughran too). Both of those helpful humans wrote their guides before Apple opened up their publishing platform for PC users to upload directly -- so they probably would not have run into this.
Thanks!