Note this is more than just a cooking video. If you don't have 24 minutes to spare, I recommend watching from the 16:26 timestamp for the cost analysis or even 21:50 for the social commentary about what this video proves vs. what it doesn't.
I think it might be a Xorg vs. Wayland thing rather than browser version. IIRC Wayland does not report coordinates of the window relative to screenspace.