ExternalInterface - No Flash/Javascript communication

I looked at the tutorial for using the ExternalInterface for Flash/Javascript communication:
https://www.kirupa.com/flash/calling_javascript_flash_using_as3.htm

I just can not get any messaging to go through between them.
Is it possible to make your html/flash files from the tutorial available?
Does anyone have working examples to share this newbie?
Is ExternalInterface outdated that nobody is responding?

Thank you