@Agama
FULLACK. Structural changes has to be done with care.
I argued carefully in this specific case, why I think it is reasonable to markup the number with em.
The number is, relative to the generic classifier "Chapter", more important.
IMHO.
But of course, an editor of such an ebook could decide different.
He may just add a span (which has by definition of the W3C no specific semantic), with a "speaking class", in this case "chapter-number" seems a good one.
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