Ironically, the only thing Emacs can't seem to do these days is be a browser. ;)
It allows you to embed GTK widgets INSIDE an emacs buffer, effectively allowing one to create actual GUIs inside of emacs.
This also allows you to embed a full webkit-based browser (with javascript support!) right into emacs, and use it like a regular browser.
Just clone the emacs repo, build it with gtk3 and xwidget support, and run 'M-x xwidget-webkit-browse-url' to get a full-fledged browser with proper rendering right inside emacs.
https://www.emacswiki.org/pics/static/EmacsXembedScreenshot....
https://en.wikipedia.org/wiki/Eww_%28web_browser%29
I don't believe there is any Javascript support, though, so you'll be out of luck for many modern pages...