The only important property is "display: oeb-page-head", which turns whatever it applies to into a header. DaleDe put it in-line, but it could have gone into the "myhead" definition.
That's the theory. But I know of no reader that makes anything with that, and worse, ADE just places the content inline as if it were normal text.
(The Gen3 headers is just a hardcoded function, and it's only the book title, cannot be changed.)
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