Variable: org-html-preamble
org-html-preamble is a customizable variable defined in ox-html.el.gz.
Value
t
Documentation
Non-nil means insert a preamble in HTML export.
When t, insert a string as defined by the formatting string in
org-html-preamble-format. When set to a string, use this
formatting string instead (see org-html-postamble-format for an
example of such a formatting string).
When set to a function, apply this function and insert the returned string. The function takes the property list of export options as its only argument.
Setting :html-preamble in publishing projects will take precedence over this variable.
Source Code
;; Defined in /usr/src/emacs/lisp/org/ox-html.el.gz
;;;; Template :: Preamble
(defcustom org-html-preamble t
"Non-nil means insert a preamble in HTML export.
When t, insert a string as defined by the formatting string in
`org-html-preamble-format'. When set to a string, use this
formatting string instead (see `org-html-postamble-format' for an
example of such a formatting string).
When set to a function, apply this function and insert the
returned string. The function takes the property list of export
options as its only argument.
Setting :html-preamble in publishing projects will take
precedence over this variable."
:group 'org-export-html
:type '(choice (const :tag "No preamble" nil)
(const :tag "Default preamble" t)
(string :tag "Custom formatting string")
(function :tag "Function (must return a string)")))