HTML Code
<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>kind — JavaScript</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 1rem;font-size:1.25rem;color:#0f172a}video{max-width:100%;border-radius:8px;border:1px solid #e2e8f0}button{margin-top:.75rem;padding:.5rem 1rem;font:inherit;cursor:pointer;border-radius:6px;border:1px solid #cbd5e1;background:#fff}.panel{margin-top:.75rem;max-width:520px;padding:.75rem 1rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px;font-size:.8125rem}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:520px}</style>

</head>

<body>

  <h1>track.kind in JavaScript</h1>

  <video controls width=400>

    <source src=https://interactive-examples.mdn.mozilla.net/media/cc0-videos/flower.webm type=video/webm>

    <track id=dynamicTrack kind=subtitles src=data:text/vtt,WEBVTT%0A%0A00%3A00%3A00.000%20--%3E%2000%3A00%3A06.000%0Akind%20starts%20as%20subtitles.%0A%0A00%3A00%3A06.000%20--%3E%2000%3A00%3A10.000%0AClick%20the%20button%20to%20change%20kind. srclang=en label=English default>

    Your browser does not support HTML video.

  </video>

  <button type=button id=updateKind>Change kind to &ldquo;descriptions&rdquo;</button>

  <div class=panel>

    <p style=margin:0>Current <code>track.kind</code>: <strong id=showKind>subtitles</strong></p>

  </div>

  <script>var track=document.getElementById("dynamicTrack"),showKind=document.getElementById("showKind");document.getElementById("updateKind").addEventListener("click",(function(){track.kind="descriptions",track.label="Audio description",showKind.textContent=track.kind,this.textContent="kind is now descriptions",this.disabled=!0}))</script>

  <p class=hint>Prefer setting <code>kind</code> in HTML. If you change it in script, update <code>label</code> too so the player menu stays clear.</p>

</body>

</html>
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HTML kind Attribute — Change kind with JavaScript
