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Result Size: 625 x 565
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<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="4/w3.css">
<body>
<div class="w3-container">
​
<h2>Dynamic Progress Bar with Labels</h2>
<p>Centered label:</p>
​
<div class="w3-light-grey">
  <div id="myBar" class="w3-container w3-green w3-center" style="width:20%">20%</div>
</div>
<br>
<button class="w3-button w3-green" onclick="move()">Click Me</button> 
​
</div>
​
<script>
function move() {
  var elem = document.getElementById("myBar");   
  var width = 20;
  var id = setInterval(frame, 10);
  function frame() {
    if (width >= 100) {
      clearInterval(id);
    } else {
      width++; 
      elem.style.width = width + '%'; 
      elem.innerHTML = width * 1  + '%';
    }
  }
}
</script>
​
</body>
​
</html> 
​
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