stylus-helpers: add transparent vendor expansion for user-select

diff --git a/stylus-helpers.styl b/stylus-helpers.styl
index 15bebc4..6f446a3 100644 (file)
--- a/stylus-helpers.styl
+++ b/stylus-helpers.styl
@@ -21,6 +21,11 @@ box-sizing()
        -webkit-box-sizing: arguments
        -moz-box-sizing: arguments
        box-sizing: arguments
+user-select()
+       -webkit-user-select: arguments
+       -moz-user-select: arguments
+       -ms-user-select: arguments
+       user-select: arguments
 
 // map "whitespace:" to "white-space:"
 whitespace()