this page: https://orgmode.org/manual/Macro-Replacement.html#index-macro-replacement_002c-during-export
says: Org also recognizes macro references in keywords, such as ‘CAPTION’, ‘TITLE’, ‘AUTHOR’, ‘DATE’, *and for some back-end specific export options.* How do I discover what those back end specific options are? Also, for various elements (e.g. begin_src emacs-lisp, begin_export html, etc...) how do I discover what the acceptable keywords are, preferably without only having to go thru the manual pages? TIA, -Kevin
