How to fullscreen facebook mode with javascript?

Related onclick go full screen and How to implement exact full screen mode in javascript? .

Facebook recently added a high-resolution image viewing feature:

When I clicked it, my browser will go into full screen mode:

This is a built-in full-screen browser similar to F11.

I would like to implement this feature for a local web application that will only be used internally, so the casual user will not be annoyed by the full screen effect.

Does anyone know how to do this? Or, alternatively, where can I get the code to implement it, explaining how it works?