The view model for 
    
FullscreenButton.
| Name | Type | Default | Description | 
|---|---|---|---|
| fullscreenElement | Element | String | document.body | optional The element or id to be placed into fullscreen mode. | 
| container | Element | String | optional The DOM element or ID that will contain the widget. | 
Members
    Gets the Command to toggle fullscreen mode.
    Gets or sets the HTML element to place into fullscreen mode when the
corresponding button is pressed.
    Gets whether or not fullscreen mode is active.  This property is observable.
    Gets or sets whether or not fullscreen functionality should be enabled.  This property is observable.
See:
    Gets the tooltip.  This property is observable.
Methods
    Destroys the view model.  Should be called to
properly clean up the view model when it is no longer needed.
Returns:
    true if the object has been destroyed, false otherwise.
    
