org-html-head-extra

org-html-head-extra is a variable defined in `ox-html.el'.
Its value is

""

• This variable is safe as a file local variable if its value
  satisfies the predicate `stringp'.

Documentation:
More head information to add in the HTML output.

You can set this on a per-file basis using #+HTML_HEAD_EXTRA:,
or for publication projects using the :html-head-extra property.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.4 of Emacs.