If a person is working on editing CSS files, he should be able to, at least Google, if this is in doubt. After enough time has seen the shorthand, this will be second nature to them. Moreover, they are likely to find it cumbersome to read 5 lines when they could read 1 (I know that I know) in order to understand what is happening. Being more detailed is not very good when you are trying to get a lot of information.
Readability issues, but its perception varies from person to person. I find the abbreviated expression is more readable, even if I need to do a Google search from time to time to make sure the order is correct. In Python, I would never have thought of not using @decorators or a list of concepts just because one of the notorious beginners might seem strange, it makes my code shorter and therefore more readable.
Hands for developers do not work. Make them suck and learn the language they get paid to create / read.
voyager
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