HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>manifest — dynamic JS (legacy)</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}.warn{max-width:520px;padding:.75rem 1rem;background:#fffbeb;border:1px solid #fcd34d;border-radius:8px;font-size:.8125rem;color:#92400e;margin-bottom:1rem}button{padding:.5rem 1rem;font:inherit;cursor:pointer;border-radius:6px;border:1px solid #cbd5e1;background:#fff}.status{margin-top:.75rem;font-size:.8125rem;color:#64748b;max-width:520px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>
</head>
<body>
  <h1>setAttribute("manifest", …)</h1>
  <p class=warn><strong>Obsolete:</strong> Even if you set the attribute in JS, browsers no longer run Application Cache.</p>
  <button type=button id=setBtn>Set manifest="dynamic.appcache"</button>
  <p class=status id=status>manifest attribute: (not set)</p>

  <script>var status=document.getElementById("status");document.getElementById("setBtn").addEventListener("click",(function(){document.documentElement.setAttribute("manifest","dynamic.appcache"),status.innerHTML="Attribute set to <code>dynamic.appcache</code> — but AppCache is removed; use Service Workers for offline support."}))</script>
</body>
</html>

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HTML manifest Attribute — Dynamic setAttribute (Legacy)