There is an example on the page w:no:User:Jeblad/Example Myrdal station of a rather huge video with a deep link nearly two hours into the movie. This movie loads and autostarts as it should in a Firefox browser on Win10, it loads but does not autostarts on Ubu18.04. Not autostarting on Ubu is probably because I have turned off autostart in the config.
All other webkit-based browsers I have tested on both OS' have failed. Edge on Win10 works, but with artifacts.
Inspecting the console in Chromium on Ubu, it says
Uncaught (in promise) DOMException: The play() request was interrupted by a call to pause(). https://goo.gl/LdLk22
The same uncaught exception is not reported in Firefox.
So, in short, seems like a bug…
The console is appended as