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Re:Flexbox and Grids: your layout’s best friends by dbbk on Tuesday November 07, 2017 @07:07AM (#15642683)
> Most flex related properties are prefixed with flex-; but some aren't (align-items, etc)

If I remember correctly that is intentional because properties like align-items are going to be added to non-flex containers in the future. Look up Box Alignment.

Re:Flexbox and Grids: your layout’s best friends by dawnerd on Tuesday November 07, 2017 @10:42AM (#15644286)
And you know, the article even says pretty much this. Flex and grid both use it.