Not much to add on the article itself other than "when Vladimir Agafonkin posts something it's probably worth checking out in detail" - too bad it doesn't come with some code to study this time ;)

Tangent: I have autoplay turned off in Firefox and had no idea half of these images were supposed to be examples of zooming in and out until halfway into the article, where one of them had a description.

This is not a critique on the article, just mentioning it for anyone else who might have similar settings. I'm also somewhat surprised that I don't even get a pop-up from Firefox asking me if I want to allow the video elements to be played.

(although I personally prefer my videos with controls enabling me to pause playback, instead of automatically looping fast-moving "gifs", which can get very disorienting while reading, but that's a different discussion)