If Emacs was compiled with the appropriate support packages, it is able to show browser widgets in its buffers. The command
M-x xwidget-webkit-browse-url asks for a URL to display in the browser widget. The URL normally defaults to the URL at or before point, but if there is an active region (see Mark), the default URL comes from the region instead, after removing any whitespace from it. The command then creates a new buffer with the embedded browser showing the specified URL. The buffer is put in the Xwidget-WebKit mode (similar to Image mode, see Image Mode), which provides one-key commands for scrolling the widget, changing its size, and reloading it. Type
C-h b in that buffer to see the key bindings.