HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>Video Sources</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{width:100%;max-width:360px;border-radius:8px;background:#0f172a}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:360px}</style>

</head>

<body>

  <h1>Video with fallback</h1>

  <video controls width=360>

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

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

    Fallback content if the browser does not support any of the sources.

  </video>

  <p class=hint>Text inside video/audio is shown only when no source can be played.</p>

</body>

</html>

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HTML source Tag — Video with Fallback