Anyway to cut a long story short, I became somewhat stuck as to what I wanted to name the class they share. All I could come up with was Xer, HeaderFooter and sandwich. Similar word groups like 'suffix' and 'prefix' give me the same issue, coming up with Xfix which is just awful nomenclature!
What categorically describes both headers and footers?
Commentary: I am *not* concerned about the web design/coding aspect of this at all.
I could easily just use:
for my particular case if that were the issue. I'm referring to header/footer as it
applies to any document or setting in the English language.
Final Results: Best coinage is Running Marginals with runner-up, Horizontal Ribbons. I've chosen Running Sections as the correct answer as this phrase is already in use while awarding bounty to Marginals (which eventually became running marginals)
This conveys attachment to the document's margins as well as the concept of "going along" said document flow. A sub-component could potentially have its own running marginals.
"Running sections" and "running elements" imply a potential to exist in contexts other than the margins of a document/component. Sections are slightly more generic in terms of the content they hold as well.
"Marginals" alone may not necessarily run with the document, such as dropdowns, map legends, scales, graph metrics, etc. This new word is handy in other contexts besides the "running" variety of marginals.