Javascript code to close window is not working on Cornerstone

Hello All,

I have developed a training and published it on cornerstone in tin can format. It starts in a separate window, and I have applied a button at the end with Javascript code that is self.close();.

but it seems not to work.

has anyone had this issue with Cornerstone before or developed another way to do so.

I cannot create a slide to instruct the trainer to simply close the window as it will take too much time.

appreciate the help.