Generated by SassMeister.com.

SassMeister-input-HTML.html

<div></div>

SassMeister-input.scss

// ----
// Sass (v3.4.12)
// Compass (v1.0.3)
// ----

// You can edit lists dynamically
$my-list: "one", "cat", "dogs";

.print-list{
  &:after {
    content: $my-list;
  }
}

$new-list: append($my-list, "platypus");

.print-list{
  &:after {
    content: $new-list;
  }
  
  &:hover {
    $new-list: append($new-list, "omg-more");
    &:after {
      content: $new-list;
    }
  }
}

SassMeister-output.css

.print-list:after {
  content: "one", "cat", "dogs";
}

.print-list:after {
  content: "one", "cat", "dogs", "platypus";
}
.print-list:hover:after {
  content: "one", "cat", "dogs", "platypus", "omg-more";
}

SassMeister-rendered.html

<div></div>