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<!DOCTYPE html>

<html lang=en>

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  <meta charset=UTF-8>

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

  <title>defer Script Example</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}pre{margin:1rem 0 0;padding:.75rem;background:#0f172a;color:#e2e8f0;border-radius:8px;font-size:.8125rem;max-width:480px}p{font-size:.875rem;color:#64748b;max-width:520px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

  <script defer src="data:application/javascript,document.getElementById('log').textContent='Deferred script ran after HTML was parsed.'"></script>

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  <h1>Defer script example</h1>

  <p>HTML parsing continues while the script downloads. Execution waits until the document is parsed.</p>

  <pre id=log>Waiting for deferred script…</pre>

  <p><code>defer</code> only applies to external scripts with a <code>src</code> attribute.</p>

</body>

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HTML defer Attribute — External Script