In desktop publishing, is there a single term to refer to both page headers and page footers?
(It's Ok if the term includes other elements, but it should exclude body text.)
Page Chrome or Document Chrome were common terms. They were far more common before Google made a web browser. Now, searching for it you just get Google references. "Chrome" referred to common content across items/pages. This, may be why Google chose that particular name for their browser.
I've also seen it referred to as Page Framing or just Framing at times.
Both of these referred to what would be seen as "Parent Page" content.. running headers & footers, etc. Anything that was common on all, or most, pages.