fullScreenWinRT.js

function fullScreen() {
  console.log("fullscreenchange");
  if (typeof Windows !== 'undefined') {
    var view = Windows.UI.ViewManagement.ApplicationView.getForCurrentView();
    if(view.IsFullScreenMode) {
      console.log("Exiting WinRT Fullscreen");
      view.ExitFullScreenMode();
    }
    else {
      console.log("Entering WinRT Fullscreen");
      view.TryEnterFullScreenMode();
    }
  };
}