Excellent Transition Mixin

transition.scss

@mixin trans-prefix($value, $prefix: "") {
  $slice: str-slice(inspect($value), 0, 9);
  @if $slice == "transform" {
    #{$prefix}transition: #{$prefix}#{$value};
  } @else {
    #{$prefix}transition: $value;
  }
}
@mixin transition($properties...) {
  @if length($properties) > 1 {
    $spec:              ();
    @for $i from 1 through length($properties) {
      $spec:            append($spec, nth($properties, $i), comma);
    }
  } @else {
    $spec:              $properties;
  }
  @include trans-prefix($spec, -webkit-);
  @include trans-prefix($spec, -moz-);
  @include trans-prefix($spec);
}