Anyone familiar with mobile visibility and zurbs foundation

Question

I am trying to hide a div on both a tablet device and a desktop. I am using zurbs foundation http://foundation.zurb.com/docs/layout.php to do so. However when I try to apply

Answer 1

I think you only need one of them: https://groups.google.com/forum/?fromgroups=#!topic/foundation-framework-/Whs4dZaS31U

I hope it helps