org-html-divs

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

((preamble "div" "preamble")
 (content "div" "content")
 (postamble "div" "postamble"))

Documentation:
Alist of the three section elements for HTML export.
The car of each entry is one of 'preamble, 'content or 'postamble.
The cdrs of each entry are the ELEMENT_TYPE and ID for each
section of the exported document.

Note that changing the default will prevent you from using
org-info.js for your website.

You can customize this variable.

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