Caveat: I am not an Emacs user, thus proposed enhancements of this
document are welcome.

Documentation: type
info emacs-w3m
https://www.emacswiki.org/emacs/emacs-w3m

Minimum configuration: in ~.emacs, have:
(require 'w3m-load)

This command:
emacs -f w3m http://slint.fr

will start w3m in emacs and load the page http://slint.fr

Alternatively, from emacs:
Meta-x w3m-browse-url [Enter] http://slint.fr
will also load this page.

Either way, a w3m sub-menu is added to emacs' menu.

Didier Spaier <didier~at~slint~dot~fr>
19 December 2018