$prefix:d1012;
$browsePrefixes:-webkit-,-moz-,-ms-;

@mixin css($styleName,$styleValue...){

  #{$styleName}:$styleValue;
  @each $browsePrefix in $browsePrefixes{
    #{$browsePrefix}#{$styleName}:$styleValue;
  }

}

[user_select='false']{

  @include css(user-select,none);

}