Split screen?

I have an oldish Huawei tablet running Android 9, it has a split screen mode which I occasionally find useful e.g. to look at details from a website while watching a video from youtube.
I was looking at a review of upcoming Android 16 features, which mentioned making split screen easier to access on phones.
wait! what? ... is that a feature already?
Apparently yes, not sure if it's Pixel specific, swipe up from the bottom to access the normal task switcher (optionally swipe sideways to pick a different app) then press the app icon at the top of the screen, select split screen from the menu, then swipe sideways to select another app.
By default you get a bar at 50:50 which you can drag to alter it to 25:75 or 75:25 as you see fit.
Probably less useful on the small screen of a phone, but who knew?