HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>onvolumechange — volume slider</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}.controls{display:flex;align-items:center;gap:.75rem;margin:1rem 0;max-width:420px}.controls label{font-size:.875rem;font-weight:600;color:#0f172a}.controls input[type=range]{flex:1}#status{padding:.75rem 1rem;border-radius:8px;font-size:.875rem;font-weight:600;max-width:420px;background:#eff6ff;border:1px solid #bfdbfe;color:#1e40af}</style>

</head>

<body>

  <h1>Custom volume controls</h1>

  <p>Move the slider or use native audio controls — <code>volumechange</code> keeps everything synced.</p>

  <audio controls id=media>

    <source src=/audio/count.mp3 type=audio/mpeg>

  </audio>

  <div class=controls>

    <label for=slider>Volume</label>

    <input type=range id=slider min=0 max=1 step=0.01 value=1 aria-label=Volume>

  </div>

  <p id=status aria-live=polite>Volume: 100%</p>



  <script>var media=document.getElementById("media"),slider=document.getElementById("slider"),status=document.getElementById("status");slider.addEventListener("input",(function(){media.volume=parseFloat(slider.value)})),media.addEventListener("volumechange",(function(){slider.value=String(media.volume),status.textContent=media.muted?"Muted":"Volume: "+Math.round(100*media.volume)+"%"}))</script>

</body>

</html>

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HTML onvolumechange Attribute — custom volume slider