HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>ontimeupdate — progress bar</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}video{display:block;max-width:100%;border-radius:8px;margin-bottom:.75rem}#progress{width:100%;max-width:320px;margin-bottom:.5rem}#label{font-size:.875rem;color:#475569}</style>

</head>

<body>

  <h1>Progress bar via timeupdate</h1>



  <video id=player width=320 controls>

    <source src=/video/count.mp4 type=video/mp4>

  </video>



  <input type=range id=progress min=0 max=100 value=0 aria-label="Playback progress">

  <p id=label aria-live=polite>0% played</p>



  <script>const player=document.getElementById("player"),bar=document.getElementById("progress"),label=document.getElementById("label");player.addEventListener("timeupdate",()=>{if(!player.duration||!isFinite(player.duration))return;const e=player.currentTime/player.duration*100;bar.value=e,label.textContent=e.toFixed(0)+"% played"})</script>

</body>

</html>

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HTML ontimeupdate Attribute — progress bar