title: Detect fullscreen (F11 triggered) on Chrome
body: <p>In Firefox 56.x , <code>window.fullscreen</code> says if the browser is in fullscreen state or not. How to detect the same in Chrome?</p>
  
  <p>Note: Assume the fullscreen is triggered by <code>F11</code> || <code>Cmd + Shift + Enter</code> and not programmatically via any of <code>document</code> methods.</p>