EWW, the Emacs Web Wowser, is a web browser package for Emacs.
It allows browsing URLs within an Emacs buffer. The command M-x
eww will open a URL or search the web. You can open a file
using the command M-x eww-open-file. You can use EWW as the
web browser for browse-url, see Following URLs. For full
details, see EWW in The Emacs Web Wowser Manual.