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That's the most succinct quick reference I've found on this (I've always had trouble digesting the css-tricks article). Have you thought about making a similar cheatsheet for Grid?

Thanks! I did not, but you might have a look at this cheatsheet: http://grid.malven.co/

Thank you, this is very helpful!

I can never keep align-items vs justify-content vs align-content vs justify-items straight and this helps (although it's missing the last one, maybe that only applies to grids).

Whoa! Nice job.

I wish this existed when I tried flexbox the first few times…

Wow, this is cool!