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> It's fairly new in general

I used `position:sticky` in a productive website back in 2015, when it was already well-supported in Firefox. What's true is that Chrome only got support for it recently, and since Chrome == the internet nowadays, you will be forgiven for considering it new.

To me 2015 is new. I wrote my first lines of JS in 2001.

Your link actually shows that it's very widely supported by everything but IE, just with a long standing bug in Blink.

Exactly. Full support won't be there until all the marked issues are fixed.

Works on my iOS13 iPad, where there are 4-5 on that page that don’t.