HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>srclang — dynamic update</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:1px solid #cbd5e1;border-radius:6px;display:block;margin-bottom:1rem;background:#0f172a}button{font:inherit;padding:.45rem .9rem;border:1px solid #cbd5e1;border-radius:6px;background:#fff;cursor:pointer;margin-right:.5rem}#status{margin-top:.75rem;font-size:.875rem;color:#475569}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>Dynamic srclang</h1>

  <video width=320 height=180 controls>

    <source src=https://interactive-examples.mdn.mozilla.net/media/cc0-videos/flower.mp4 type=video/mp4>

    <track id=dynamicTrack src="data:text/vtt;charset=utf-8,WEBVTT%0A%0A00:00:00.000%20--%3E%2000:00:04.000%0ADynamic%20track%20demo" kind=subtitles srclang=en label=Track default>

  </video>

  <button type=button id=setEn>Set srclang to en</button>

  <button type=button id=setFr>Set srclang to fr</button>

  <p id=status>Current srclang: <code>en</code></p>

  <script>var track=document.getElementById("dynamicTrack"),status=document.getElementById("status");document.getElementById("setEn").addEventListener("click",(function(){track.srclang="en",track.label="English",status.innerHTML="Current srclang: <code>en</code>"})),document.getElementById("setFr").addEventListener("click",(function(){track.srclang="fr",track.label="French",status.innerHTML="Current srclang: <code>fr</code>"}))</script>

</body>

</html>

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HTML srclang Attribute — Dynamic JavaScript Update