Man, why is it so hard to keep in memory ? Can keep a whole bunch of stuff in memory - including CSS float layout for years, but flexbox hits that strange place where if one doesn't use it for a couple of months, one tends to forget 80% of it and needs to re-read from scratch and spend time on the playground again.

The problem is that too many property names are just non-intuitive or plain wrong. They might as well have given them one or two letter symbolic names.