HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>script defer</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 .5rem;font-size:1.25rem;color:#0f172a}p{margin:0 0 1rem;font-size:.9375rem;max-width:420px}#status{padding:.75rem 1rem;background:#ecfdf5;border:1px solid #a7f3d0;border-radius:8px;font-size:.875rem;color:#065f46;max-width:420px}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}</style>
</head>
<body>
  <h1>defer attribute</h1>
  <p>HTML content loads first. The deferred script runs after parsing.</p>
  <div id=status>Waiting for deferred script...</div>
  <script defer>document.getElementById("status").textContent="Deferred script ran after HTML was parsed."</script>
  <p class=hint>defer downloads in parallel and executes after the document is parsed.</p>
</body>
</html>

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HTML script Tag — defer Attribute