I’m a little surprised about the two word display specifiers (e.g. display: inline flex). Specifically they say they are the only browser to support it but I fe

I’m a little surprised about the two word display specifiers (e.g. display: inline flex). Specifically they say they are the only browser to support it but I feel like I saw this somewhere (maybe in a nightly release of some browser) at least two years ago. Maybe I just saw a spec or maybe I’m just wrong