Detect fullscreen (F11 triggered) on Chrome

Question

In Firefox 56.x , window.fullscreen says if the browser is in fullscreen state or not. How to detect the same in Chrome?

Note: Assume the fullscreen is triggered by F11 || Cmd + Shift + Enter and not programmatically via any of document methods.

Answer 1

A decent workaround might be to see if screen.width === window.outerWidth && screen.height === window.outerHeight.