Sass 101 - A newb's guide: Operations - list of values

Lists are how Sass represents the values of CSS declarations like margin: 10px 15px 0 0 or font-face: Helvetica, Arial, sans-serif. Lists are just a series of other values, separated by either spaces or commas. In fact, individual values count as lists, too: they’re just lists with one item.

By themselves, lists don't do much. This example illustrates using a list with the @each rule to create a series of CSS rules based on a list of vendor prefixes.

Read more on lists

$prefix-defaults: -moz- -webkit- -o- -ms- "" !default;

@mixin border-radius($border-radius, $prefixes: $prefix-defaults) {
  @each $prefix in $prefixes {
    #{$prefix}border-radius: $border-radius;
  }
}

.box {
  @include border-radius(10px);
}

SassMeister Gist