scss multi browser setting

lib.scss

@charset "utf-8";

@mixin vpcss($key, $val){
    -webkit-#{$key}: $val;
       -moz-#{$key}: $val;
        -ms-#{$key}: $val;
         -o-#{$key}: $val;
            #{$key}: $val;
}

@mixin vvcss($key, $val){
    #{$key}: -webkit-#{$val};
    #{$key}:    -moz-#{$val};
    #{$key}:     -ms-#{$val};
    #{$key}:      -o-#{$val};
    #{$key}:         #{$val};
}

@mixin vvvcss($key, $val, $key2, $val2){
  -webkit-#{$key}: $val, -webkit-#{$key2} $val2;
     -moz-#{$key}: $val,    -moz-#{$key2} $val2;
      -ms-#{$key}: $val,     -ms-#{$key2} $val2;
       -o-#{$key}: $val,      -o-#{$key2} $val2;
          #{$key}: $val,         #{$key2} $val2;
}