Sass-mixin to provide rgba for modern browsers and with a fallback for oldIE

SassMeister-input.scss

// ---
// Sass (v3.2.9)
// ---


// Converts a solid color with an alpha-channel-value into rgba 
// and an IE-filter as fallback for oldIE (IE up to version 8)
@mixin all-rgba($color, $alpha) {
  $rgba: rgba($color, $alpha);
  $ie-color: ie-hex-str($rgba);
	  background-color: $rgba;
  	  filter: progid:DXImageTransform.Microsoft.Gradient(GradientType=1, StartColorStr='#{$ie-color}', EndColorStr='#{$ie-color}');
	  zoom: 1;
}

.test {
    @include all-rgba(#ccc, 0.75);    
}

SassMeister-output.css

.test {
  background-color: rgba(204, 204, 204, 0.75);
  filter: progid:DXImageTransform.Microsoft.Gradient(GradientType=1, StartColorStr='#BFCCCCCC', EndColorStr='#BFCCCCCC');
  zoom: 1;
}