HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>default on track</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{width:100%;max-width:360px;border-radius:8px;background:#0f172a}p{font-size:.875rem;color:#64748b;max-width:520px;margin-top:1rem}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>Default English subtitles</h1>

  <video controls width=360 height=202>

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

    <track kind=subtitles src=/video/count.vtt srclang=en label=English default>

    <track kind=subtitles src=/video/count_es.vtt srclang=es label=Español>

    Your browser does not support the video tag.

  </video>

  <p>Only one <code>&lt;track&gt;</code> per kind should have <code>default</code>. English subtitles load first; users can switch to Español in the player.</p>

</body>

</html>

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HTML default Attribute — Default Subtitle Track