On Mac
Run the following terminal command to start up an apache server:
$ sudo apachectl start
Then, move the contents of your build/web folder to /Library/WebServer/Documents/
(Note: Index.html base href should be "/" if you had previously modified it)
Now, navigate web browser to localhost
Once done, kill the apache server with the following command:
$ sudo apachectl graceful-stop
On Windows
Download XAMPP, install, allow it to run on local networks if prompted, then launch the XAMPP app (it will likely have launched on its own).
In the XAMPP app, find the row for "Apache" and click the "Start" button to start up the web server
Move the contents of your build/web folder to C:/xampp/htdocs/
(Note: Index.html base href should be "/" if you had previously modified it)
Now navigate web browser to 127.0.0.1/index.html
Once done, open the XAMPP app and click "stop" on the Apache row.