See for example:
http://simpl.info/videonoautoplay/

Also, in this case, it shows up late:
https://mounirlamouri.github.io/sandbox/media/dynamic-controls.html

Finally, in this case, it shows up immediately:
https://mounirlamouri.github.io/sandbox/preload/test-auto.html

It would be great if we could show reliable media download information so developers can optimise the bandwidth usage for their users.