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

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Last I heard:

Logged in roaming from Europe (during biggest floods in Bosnia)

and, back on-topic:

let Grunt or Gulp take care of prefixing, why would you even want to maintain this when you can abstract it and let the community keep up with changes.

I you want grunt/gulp for all they offer, that’s great. But if you really only need to solve this problem, I’d suggest using one of the wide variety of prefixer-type mixins in major sass libraries (compass and bourbon both have them, for example).