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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>async 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 1rem;font-size:1.25rem;color:#0f172a}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:480px}</style>
</head>
<body>
  <h1>Async script example</h1>
  <p>The page continues rendering while the script downloads in parallel.</p>
  <script async src="data:application/javascript,console.log('Async script executed')"></script>
  <p class=hint>Open the browser console (F12) to see when the async script runs. <code>async</code> only applies to external scripts with a <code>src</code> attribute.</p>
</body>
</html>

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HTML async Attribute — External Script