Well, that refusal to discuss the topic on this (appropriate) forum seems to have been short-lived.
What the OP seems not to comprehend is that the method of creating the "page header," and the software used to create the ePUB (whether Sigil, Calibre, etc.) is irrelevant; the fact the the CSS is unsupported across the board, by ePUB DEVICES, is the issue. Sigil is, and was, utterly irrelevant to the question, the topic, and the answer.
@P3aul: the vast majority of epub readers (people) are not happy with "wasted space" being used by page headers, as they figure they are intelligent enough to know what book they are reading. It's like the "extra line" between paragraphs created by writers hitting the "enter" key twice before starting the next paragraph. I suspect that while most ePUB-folks continue to object to wasting space this way, most devices will continue to not support it. Apple provides a "page header," but it pulls the information from the metadata, NOT the CSS, so whatever you put there would be overriden; ditto Kindle8. Again: to be clear, this has nothing whatsoever to do with Sigil.
Hitch
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