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<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>Dynamic autoplay Example</title>
  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}video{width:100%;max-width:400px;border-radius:8px;background:#0f172a}p{font-size:.875rem;color:#64748b;max-width:420px;line-height:1.6}</style>
</head>
<body>
  <h1>Dynamic autoplay</h1>
  <video id=dynamicVideo width=400 height=225 controls muted playsinline>
    <source src=/video/count.mp4 type=video/mp4>
    Your browser does not support the video tag.
  </video>
  <p>JavaScript sets <code>autoplay = true</code> and calls <code>load()</code> so playback can start after the attribute changes.</p>
  <script>var videoElement=document.getElementById("dynamicVideo");videoElement.autoplay=!0,videoElement.load()</script>
</body>
</html>

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HTML autoplay Attribute — Dynamic JavaScript