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// 1
@mixin crossBrowser($property, $val){
  -webkit-#{$property}: $val;
  -moz-#{$property}: $val;
  -ms-#{$property}: $val;
  #{$property}: $val;
}

// 2
@mixin prefix($property, $value, $prefixes: ()) {
  @each $prefix in $prefixes {
    #{'-' + $prefix + '-' + $property}: $value;
  }
 
  // Output standard non-prefixed declaration
  #{$property}: $value;
}

.selector {
  @include prefix(transform, rotate(45deg), webkit ms);
}


//3
@mixin prefix($declarations, $prefixes: ()) {
  @each $property, $value in $declarations {
    @each $prefix in $prefixes {
      #{'-' + $prefix + '-' + $property}: $value;
    }

    // Output standard non-prefixed declaration
    #{$property}: $value;
  }
}

// how to use
.selector {
  @include prefix((
    column-count: 3,
    column-gap: 1.5em,
    column-rule: 2px solid hotpink
  ), webkit moz);
}

// output
.selector {
  -webkit-column-count: 3;
  -moz-column-count: 3;
  column-count: 3;
  -webkit-column-gap: 1.5em;
  -moz-column-gap: 1.5em;
  column-gap: 1.5em;
  -webkit-column-rule: 2px solid hotpink;
  -moz-column-rule: 2px solid hotpink;
  column-rule: 2px solid hotpink;
}