Determines the full screen support of the browser running this Phaser Game instance.
These values are read-only and populated during the boot sequence of the game.
They are then referenced by internal game systems and are available for you to access
this.sys.game.device.fullscreen from within any Scene.
Does the browser support the Full Screen API?
Does the browser support access to the Keyboard during Full Screen mode?
If the browser supports the Full Screen API this holds the call you need to use to cancel it.
If the browser supports the Full Screen API this holds the call you need to use to activate it.