Reply To: Why won't this @mixin work?

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Well, they don’t do

+prefixer( border-radius, 5px, webkit moz ms )

but rather, beforehand

=border-raduis( $radius )
    +prefixer( border-radius, $radius, webkit moz ms )

and then

+border-radius( 5px )

…if you follow. (not that any of that was actual code.) It’s extra work that you might not want to put into your own solution, but it is a level of abstraction that does a good job of solving the “shotgun prefixer” problem.