I am trying to get this working, however despite the code being as it is in my book, it seems to fail below the point indicated.

I am not sure if this is my configuration (browser is chromium on Debian 10) or something else.

I just wondered if the other people here can test this please and help be figure out if works for other people, if it does than it suggests there is an issue with my browser.

Thanks for any help

If it helps, my browser info is as follows.

Version 73.0.3683.75 (Developer Build) built on Debian buster/sid, running on Debian 10.0 (64-bit)