Sass glitch mixin

glitch.scss

/*
  @credit: http://css-tricks.com/glitch-effect-text-images-svg/
  
  (TEXT) PARAMS
  =================
  1. Namespace
  2. Intensity
  3. Text color
  4. Background color (flat)
  5. Highlight #1 color
  6. Highlight #2 color
  7. Width (px)
  8. Height (px)
  
  @example
  @include textGlitch("example-one", 17, white, black, red, blue, 450, 115);
*/

@mixin textGlitch($name, $intensity, $textColor, $background, $highlightColor1, $highlightColor2, $width, $height) {
  
  color: $textColor;
  position: relative;
  $steps: $intensity;
  
  // Ensure the @keyframes are generated at the root level
  @at-root {
    // We need two different ones
    @for $i from 1 through 2 {
      @keyframes #{$name}-anim-#{$i} {
        @for $i from 0 through $steps {
          #{percentage($i*(1/$steps))} {
            clip: rect(
              random($height)+px,
              $width+px,
              random($height)+px,
              0
            );
          }
        }
      }
    }
  }
  &:before,
  &:after {
    content: attr(data-text);
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    background: $background;
    clip: rect(0, 0, 0, 0); 
  }
  &:after {
    left: 2px;
    text-shadow: -1px 0 $highlightColor1;
    animation: #{$name}-anim-1 2s infinite linear alternate-reverse;
  }
  &:before {
    left: -2px;
    text-shadow: 2px 0 $highlightColor2; 
    animation: #{$name}-anim-2 3s infinite linear alternate-reverse;
  }
  
}