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              <div class="blob">
  <div class="anim head"></div>
  <div class="anim body"></div>
  <div class="anim hand left"></div>
  <div class="anim hand right"></div>
  <div class="anim foot left"></div>
  <div class="anim foot right"></div>
</div>
<div class="controls">
  <!--div data-mapping="all">
    <label>All</label>
    <input type="range" min="0" max="100" />
    <button class="pause">&#9616;&#9616;</button>
    <button class="rate-2x">2x</button>
  </div-->
  <div data-mapping="head">
    <label>Head</label>
    <input type="range" min="0" max="100" />
    <button class="pause">&#9616;&#9616;</button>
    <button class="rate-2x">2x</button>
  </div>
  <div data-mapping="body">
    <label>Body</label>
    <input type="range" min="0" max="100"/>
    <button class="pause">&#9616;&#9616;</button>
    <button class="rate-2x">2x</button>
  </div>
  <div data-mapping="leftHand">
    <label>Left Hand</label>
    <input type="range" min="0" max="100"/>
    <button class="pause">&#9616;&#9616;</button>
    <button class="rate-2x">2x</button>
  </div>
  <div data-mapping="rightHand">
    <label>Right Hand</label>
    <input type="range" min="0" max="100"/>
    <button class="pause">&#9616;&#9616;</button>
    <button class="rate-2x">2x</button>
  </div>
  <div data-mapping="leftFoot">
    <label>Left Foot</label>
    <input type="range" min="0" max="100"/>
    <button class="pause">&#9616;&#9616;</button>
    <button class="rate-2x">2x</button>
  </div>
  <div data-mapping="rightFoot">
    <label>Right Foot</label>
    <input type="range" min="0" max="100"/>
    <button class="pause">&#9616;&#9616;</button>
    <button class="rate-2x">2x</button>
  </div>
</div>
            
          
!
            
              $dark: #333;
$light: #fafafb;
$red: #922;
$green: #292;
$blue: #229;
$yellow: #c92;
$orange: #c65;
$greenBlue: #299;
$background: #BECAC5;

* {
  box-sizing: border-box;
}
body {
  background: $background;
  font-family: Helvetica, sans-serif;
}
.blob {
  display: inline-block;
  width: 23rem;
  height: 20rem;
}
.anim {
  //display: inline-block;
  border-radius: 50%;
  border: .4rem solid $light;
  width: 4rem;
  height: 4rem;
  position: absolute;
  left: 9.5rem;
  top: 3rem;
  
  &.head {
    border-color: $greenBlue;
  }
  &.body {
    border-color: $yellow;
    width: 6rem;
    height: 6rem;
    top: 8rem;
    left: 8.5rem;
  }
  &.hand {
    border-color: $red;
    top: 8rem;
    left: 15rem;
    
    &.left {
      //border-color: $green;
      left: 4rem;
    }
  }
  &.foot {
    border-color: $orange;
    top: 15rem;
    left: 7rem;
    
    &.right {
      //border-color: $blue;
      left: 12rem;
    }
  }
}

.controls {
  display: inline-block;
  width: 23rem;
  padding-top: 1rem;
  div {
    border: 0 solid $dark;
    overflow: auto;
    margin-bottom: 1rem;
  }
  
  label {
    display: block;
    margin-left: .5rem;
    font-size: .8rem;
  }
  
  input[type="range"] {
    width: 16rem;
    display: inline-block;
    margin: .5rem;
    float: right;
  }
  button {
    -webkit-appearance: none;
    -moz-appearance: none;
    -ms-appearance: none;
    background: transparent;
    border: none;
    color: $dark;
    line-height: 1;
    margin: .5rem;
    text-align: center;
    padding: .2rem .5rem .2rem .3rem;
    border-radius: .3rem;
    transition: background .15s linear, color .15s linear;
    border: 1px solid $dark;
    float: left;
    
    &.active {
      background: $dark;
      color: $light;
    }
  }
}
            
          
!
            
              var animations = {};
animations.leftFoot = document.querySelector('.foot.left').animate([
    { transform: 'scale(1)' },
    { transform: 'scale(.6)' }
  ], {
    duration: 700,
    iterations: Infinity,
    direction: 'alternate',
    delay: 0//100 * i
  });
animations.rightFoot = document.querySelector('.foot.right').animate([
    { transform: 'scale(.6)' },
    { transform: 'scale(1)' }
  ], {
    duration: 700,
    iterations: Infinity,
    direction: 'alternate',
    delay: 0
  });
animations.rightHand = document.querySelector('.hand.right').animate([
    { transform: 'scale(1)' },
    { transform: 'scale(.6)' }
  ], {
    duration: 700,
    iterations: Infinity,
    direction: 'alternate',
    delay: 0//100 * i
  });
animations.leftHand = document.querySelector('.hand.left').animate([
    { transform: 'scale(.6)' },
    { transform: 'scale(1)' }
  ], {
    duration: 700,
    iterations: Infinity,
    direction: 'alternate',
    delay: 0
  });
animations.body = document.querySelector('.body').animate([
    { transform: 'translateY(0)' },
    { transform: 'translateY(1rem)' }
  ], {
    duration: 350,
    iterations: Infinity,
    direction: 'alternate',
    delay: 15
  });
animations.head = document.querySelector('.head').animate([
    { transform: 'translateY(0)' },
    { transform: 'translateY(1rem)' }
  ], {
    duration: 350,
    iterations: Infinity,
    direction: 'alternate',
    delay: 105
  });

var ranges = document.querySelectorAll('input[type="range"]');
for (let i = 0, len = ranges.length; i < len; i++) {
  var range = ranges[i];
  range.disabled = true;
  range.value = 0;
  range.addEventListener('change', rangeHandler);
}
var pauses = document.querySelectorAll('.pause');
for (let i = 0, len = pauses.length; i < len; i++) {
  pauses[i].addEventListener('click', pauseHandler);
}

var rates = document.querySelectorAll('.rate-2x');
for (let i = 0, len = rates.length; i < len; i++) {
  rates[i].addEventListener('click', rateHandler);
}

var duration = 1400;

function rangeHandler(e) {
  console.log('Enter rangeHandler');
  var target = e.currentTarget;
  var percent = parseInt(target.value, 10)/100;
  var player = animations[target.parentNode.getAttribute('data-mapping')];
 
 player.currentTime = percent * duration;
  
}
function rateHandler(e) {
  console.log('Enter rateHandler');
  var target = e.currentTarget;
  
  var player = animations[target.parentNode.getAttribute('data-mapping')];
 
 var wasActive = target.classList.contains('active');
 target.classList[wasActive ? 'remove' : 'add']('active');
 player.playbackRate = wasActive ? 1 : 2;
}

function pauseHandler(e) {
  console.log('Enter pauseHandler');
  var target = e.currentTarget;
  var mapping = target.parentNode.getAttribute('data-mapping');
  var player = animations[mapping];
  
  if (player.playState === 'paused') {
    player.play();
    console.log(player.playbackRate);
    target.classList.remove('active');
    document.querySelector('[data-mapping="'+mapping+'"] input').disabled = true;
  } else {
    let currentRange = document.querySelector('[data-mapping="'+mapping+'"] input');
    currentRange.disabled = false;
    currentRange.value = (player.currentTime % duration) / duration * 100;
    
    player.pause();
    target.classList.add('active');
  }
}

animations.leftHand.onfinish = function(e) {
  console.log(e);
}

/* currentTime DOES take playbackRate into account... nice.
setInterval(function() {
  console.log(animations.head.currentTime,animations.body.currentTime);
}, 1000);
//*/
            
          
!
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