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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
  <div class="progress-wrapper">
    <div id="progress"></div>
  </div>
  <pre>
    
  </pre>
  <button id="stage1">stage1</button>
  <button id="stage2">stage2</button>
  <button id="stage3">stage3</button>
</body>
</html>
 
.progress-wrapper {
  height: 10px;
  width: 400px;
  background-color: #BBDEFB;
}
​
#progress {
  background-color: #AADE00;
  height: 10px;
  width: 0;
}
​
.stage1 {
  animation-name: stage1;
  animation-duration: 1s;
  animation-fill-mode: forwards;
}
​
@keyframes stage1 {
  to {
    width: 30%;
  }
}
​
.stage2 {
  animation-name: stage2;
  animation-duration: 1s;
  animation-fill-mode: forwards;
}
​
@keyframes stage2 {
  to {
    width: 70%;
  }
}
​
.stage3 {
  animation-name: stage3;
  animation-duration: 1s;
  animation-fill-mode: forwards;
}
​
@keyframes stage3 {
  to {
    width: 100%;
  }
}
 
document.getElementById('stage1').addEventListener('click', function() {
  document.getElementById('progress').classList.add('stage1');
}, false);
​
document.getElementById('stage2').addEventListener('click', function() {
  document.getElementById('progress').classList.add('stage2');
}, false);
​
document.getElementById('stage3').addEventListener('click', function() {
  document.getElementById('progress').classList.add('stage3');
}, false);
Output

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