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SassMeister-input.sass

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

@include keyframe (block-1-animate)
  0%
    width: 0
  16.6%
    left: 0
    right: auto
    width: 100%
  33.2%
    left: auto
    right: 0
    width: 0

// Add vendor prefixes to keyframes
@mixin keyframe ($animation-name) 
  @-webkit-keyframes $animation-name
    @content

  @-moz-keyframes $animation-name
    @content

  @-o-keyframes $animation-name
    @content

  @keyframes $animation-name
    @content

// @include animation(block-1-animate, $speed, ease-out, infinite)
@mixin animation ($animation, $duration, $transition, $iteration)
  -webkit-animation-name: $animation
  -webkit-animation-duration: $duration
  -webkit-animation-timing-function: $transition
  -webkit-animation-iteration-count: $iteration

  -moz-animation-name: $animation
  -moz-animation-duration: $duration
  -moz-animation-timing-function: $transition
  -moz-animation-iteration-count: $iteration

  -o-animation-name: $animation
  -o-animation-duration: $duration
  -o-animation-timing-function: $transition
  -o-animation-iteration-count: $iteration

  animation-name: $animation
  animation-duration: $duration
  animation-timing-function: $transition
  animation-iteration-count: $iteration

SassMeister-output.css

Undefined mixin 'keyframe'.