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Browsing through default Webkit CSS here I noticed the following piece of code:
:focus {
outline: auto 5px -webkit-focus-ring-color
}
It seems -webkit-focus-ring-color is a variable of some sort. I thought CSS could not have variables. What is going on here?
That’s called a vendor prefix. You can check out a previously answered question about a list of VPs here.
Regarding your question of variables in CSS, there is a way to use variables in CSS development. I’m sure there are other ways, but the most popular are {less css} and SASS.