Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.2.14)
// Compass (v0.12.2)
// ----

@import "compass";

@mixin compositeFill($size: 100px, $gradient: (top, #000000 0%, #FFFFFF 100%)) {

    $isTop: nth($gradient, 1) == "top";
    $direction: if($isTop, vertical, horizontal);
    $widthHeight: if($isTop, height, width);
    $heightWidth: if($isTop, width, height);

    @include background-image(linear-gradient($gradient...));
}

test {
  @include compositeFill();
}

SassMeister-output.css

test {
  background-image: -webkit-gradient(linear, 50% 0%, 50% 100%, color-stop(0%, #000000), color-stop(100%, #ffffff));
  background-image: -webkit-linear-gradient(top, #000000 0%, #ffffff 100%);
  background-image: -moz-linear-gradient(top, #000000 0%, #ffffff 100%);
  background-image: -o-linear-gradient(top, #000000 0%, #ffffff 100%);
  background-image: linear-gradient(top, #000000 0%, #ffffff 100%);
}