Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.0.rc.2)
// Compass (v1.0.0.alpha.17)
// ----

@mixin make_progress($val,$col){
  progress[value="#{$val}"] {
    color: #{$col};
    &::-webkit-progress-value { background-color:  #{$col}; }
    &::-moz-progress-bar { background-color: #{$col}; }
  }
}

@mixin progress-value($value-color...) {
    @each $progress in $value-color {
      @include make_progress(str-slice($progress,0,-10),unquote(str-slice($progress,-7)));
    }
}

// Calling the mixin
@include progress-value("0.25, #de2b23");
// and with a multideimensional list
@include progress-value("0.5, #FF8330", "0.75, #8A9F4A", "1, #14BB64");

SassMeister-output.css

progress[value="0.25"] {
  color: #de2b23;
}
progress[value="0.25"]::-webkit-progress-value {
  background-color: #de2b23;
}
progress[value="0.25"]::-moz-progress-bar {
  background-color: #de2b23;
}

progress[value="0.5"] {
  color: #FF8330;
}
progress[value="0.5"]::-webkit-progress-value {
  background-color: #FF8330;
}
progress[value="0.5"]::-moz-progress-bar {
  background-color: #FF8330;
}

progress[value="0.75"] {
  color: #8A9F4A;
}
progress[value="0.75"]::-webkit-progress-value {
  background-color: #8A9F4A;
}
progress[value="0.75"]::-moz-progress-bar {
  background-color: #8A9F4A;
}

progress[value="1"] {
  color: #14BB64;
}
progress[value="1"]::-webkit-progress-value {
  background-color: #14BB64;
}
progress[value="1"]::-moz-progress-bar {
  background-color: #14BB64;
}