HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>nomodule — dynamic injection</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}button{padding:.5rem 1rem;font:inherit;cursor:pointer;border-radius:6px;border:1px solid #1d4ed8;background:#2563eb;color:#fff}.status{margin-top:1rem;padding:.75rem 1rem;background:#f0fdf4;border:1px solid #bbf7d0;border-radius:8px;font-size:.8125rem;max-width:480px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>
</head>
<body>
  <h1>Detect module support</h1>
  <button type=button id=runBtn>Inject script based on support</button>
  <div class=status id=status>Click the button to detect support and inject the correct script.</div>

  <script>document.getElementById("runBtn").addEventListener("click",(function(){var e=document.getElementById("status");if("noModule"in HTMLScriptElement.prototype){var t=document.createElement("script");t.type="module",t.textContent="console.log('Dynamic module script appended');",document.body.appendChild(t),e.innerHTML="Result: <code>noModule</code> detected - this browser supports ES modules. Injected a <code>type=&quot;module&quot;</code> script; <code>nomodule</code> fallbacks are skipped."}else{e.textContent="No module support. Injecting nomodule fallback script...";var o=document.createElement("script");o.setAttribute("nomodule",""),o.textContent="document.getElementById('status').textContent = 'Result: nomodule fallback script ran (legacy browser).';",document.body.appendChild(o)}}))</script>
</body>
</html>

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HTML nomodule Attribute — Dynamic Script Injection