Sass mixin to automate the CSS animation process, including vendor prefixes

sass-mixin-animations.scss

//Animation mixin setup
@mixin keyframes($animation-name) {
    @-webkit-keyframes #{$animation-name} {
        @content;
    }
    @-moz-keyframes #{$animation-name} {
        @content;
    }  
    @-ms-keyframes #{$animation-name} {
        @content;
    }
    @-o-keyframes #{$animation-name} {
        @content;
    }  
    @keyframes #{$animation-name} {
        @content;
    }
}
@mixin animation($str) {
  -webkit-animation: #{$str};
  -moz-animation: #{$str};
  -ms-animation: #{$str};
  -o-animation: #{$str};
  animation: #{$str};      
}
//Usage
// Define animation name, and properties
@include keyframes(fade-out) {
  0% { opacity: 1; }
  90% { opacity: 0; }
}
// Add animation to element
.element {
  width: 100px;
  height: 100px;
  background: black;
  @include animation('fade-out 5s 3');
}