Ability to add logo to HTML export

[Vladimir Alexiev <vladimir.alexiev@ontotext.com>]

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Some projects have a logo, which one may want to add to the beginning of a
HTML document.
Eg like this (before authors and Title):
[image: image.png]

Right now I have to resort to a bad kludge to do that: a local variable in
the org file:

#+comment: -*- org-html-preamble: "<p class='author'>Author:
%a<br/>(%e)</p><p class='date'>Date: %d</p><p><img
src='./img/SemBSDD-Logo-400px.png'/></p>" -*-

And also this in my org setup:

(put 'org-html-preamble 'safe-local-variable 'stringp)

I looked at

(org-export-define-backend 'html
  :options-alist
    (:html-preamble nil "html-preamble" org-html-preamble)

and the help for org-export-options-alist:
this word "html-preamble" corresponds to:

OPTION is a string that could be found in an #+OPTIONS: line.

So I tried this, but it had no effect"

#+OPTION: html-preamble: "<p class='author'>Author: %a<br/>(%e)</p><p
class='date'>Date: %d</p><p><img src='./img/SemBSDD-Logo-400px.png'/></p>"

Minor note: normally, I distribute the standard variables between preamble
and postamble as follows:

(setq
 org-html-preamble-format '(("en" "<p class=\"author\">Author: %a (%e)</p>
<p class=\"date\">Date: %d</p>"))
 org-html-postamble t                   ; was 'auto which inserts author,
date: but I want those in preamble
 org-html-postamble-format  '(("en" "<p class=\"creator\">Exported by %c</p>
<p class=\"validation\">%v</p>"))
)

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