Update

even refreshing the page the videos start automatically when in vie (from the last position

Thanks for checking. I have not been able to see what the videos are doing on the phone screen because of what I said above. But on a desktop and laptop, it can be seen that the videos stop playing when the next one comes fully into view. Also, if I scroll back, I see that they start from the beginning again.
I have the video controls enabled, for all sizes, but I don't know if my phone can cope with that, that's why I'm asking others to test it.
Also, I have noticed that on my phone there is no scrollbar. I can probably adjust the bit of the next video to show more of it, so that one can grab the edge of it and scroll that way. But it is that automatically switching to full-width that is making it difficult for me.
My iPhone 6 is not the newest in the market, but I find it preposterous if I have to buy a new one just for this.

One more thing: I have made some changes to the downloadable component but not to the one displaying on the site yet. So when checking, please download the thing. I'll update the page, but that will have to wait until tomorrow, it's past midnight here.

I sent you a video showing what's going on on my desktop from here in Indonesia aso you can see the effects are as I described, don't have a video screen recorder for my phone otherwise you would also be able to see what the effects are that I described

Thanks, Wayan. I've seen it. I will work on this tomorrow. Now I'm off to bed. I have been snow clearing on the roof today and am quite tired.