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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="/lib/w3.css"> <body class="w3-container"> <h2>Dynamic Progress Bar with Labels</h2> <p>Left-aligned label:</p> <div class="w3-progress-container"> <div id="myBar" class="w3-progressbar w3-green" style="width:20%"> <div id="demo" class="w3-container w3-text-white">20%</div> </div> </div> <br> <button class="w3-btn w3-dark-grey" onclick="move()">Click Me</button> <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 + '%'; document.getElementById("demo").innerHTML = width * 1 + '%'; } } } </script> </body> </html>