Is the browser currently in fullscreen mode? This is a read-only getter that checks the various vendor-prefixed fullscreen element properties on the document.
Does the browser support the Full Screen API?
If the browser supports the Full Screen API, this holds the name of the method to call on the document in order to exit fullscreen mode.
Does the browser support access to the Keyboard during Full Screen mode?
If the browser supports the Full Screen API, this holds the name of the method to call on a DOM element in order to request fullscreen mode.
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 via
this.sys.game.device.fullscreenfrom within any Scene.