To find the HTML code, you need to have the Web page open in your browser. Go to "Tools," select "Web Developer" and click "Page Source" in Mozilla Firefox to see your Facebook HTML.

The beauty of open source programming is that there are a lot of code libraries available to software application developers, obviously. Some would call it a ‘goldmine’ of open source code.

The original source code for the World Wide Web, written by British computer scientist Sir Tim Berners-Lee, is being auctioned as a non-fungible token.