Generated by SassMeister.com.

SassMeister-input-HTML.html

<div class="test"></div>

SassMeister-input.scss

// ----
// Sass (v3.4.11)
// Compass (v1.0.3)
// ----

$array: #9f9f9f, 0%, #7a7a7a, 75% !default;

@mixin gradient-linear-vertical ($startcol:#FFF, $startloc:0%, $endcol:#000, $endloc:100%){
	@if $startcol == $endcol {
		background: $startcol;
	} @else {
		background: mix($startcol, $endcol);
		background: -webkit-gradient(linear, left top, left bottom, color-stop($startloc, $startcol), color-stop($endloc, $endcol)); /* Chrome,Safari4+ */
		background: -webkit-linear-gradient(top,	$startcol $startloc, $endcol $endloc); /* Chrome10+,Safari5.1+ */

		background: -moz-linear-gradient(top,	 $startcol $startloc, $endcol $endloc);
		background: -o-linear-gradient(top,  $startcol $startloc,$endcol $endloc);
		background: -ms-linear-gradient(top,	$startcol $startloc,$endcol $endloc);
		background: linear-gradient(top,	$startcol $startloc,$endcol $endloc);
		//filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr='#{ie-hex-str($startcol)}',endColorstr='#{ie-hex-str($endcol)}',GradientType=0)";
	}
}

$array: #999999, 0%, #999999, 75% !default;

.div {
  @include gradient-linear-vertical($array...);
  &.disabled {
    @include gradient-linear-vertical($array...);
  }
}

SassMeister-output.css

.div {
  background: #8c8c8c;
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #9f9f9f), color-stop(75%, #7a7a7a));
  /* Chrome,Safari4+ */
  background: -webkit-linear-gradient(top, #9f9f9f 0%, #7a7a7a 75%);
  /* Chrome10+,Safari5.1+ */
  background: -moz-linear-gradient(top, #9f9f9f 0%, #7a7a7a 75%);
  background: -o-linear-gradient(top, #9f9f9f 0%, #7a7a7a 75%);
  background: -ms-linear-gradient(top, #9f9f9f 0%, #7a7a7a 75%);
  background: linear-gradient(top, #9f9f9f 0%, #7a7a7a 75%);
}
.div.disabled {
  background: #8c8c8c;
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #9f9f9f), color-stop(75%, #7a7a7a));
  /* Chrome,Safari4+ */
  background: -webkit-linear-gradient(top, #9f9f9f 0%, #7a7a7a 75%);
  /* Chrome10+,Safari5.1+ */
  background: -moz-linear-gradient(top, #9f9f9f 0%, #7a7a7a 75%);
  background: -o-linear-gradient(top, #9f9f9f 0%, #7a7a7a 75%);
  background: -ms-linear-gradient(top, #9f9f9f 0%, #7a7a7a 75%);
  background: linear-gradient(top, #9f9f9f 0%, #7a7a7a 75%);
}

SassMeister-rendered.html

<div class="test"></div>