HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>Dynamic as Example</title>
  <link rel=preload href=/script/demo.js as=script id=dynamicLink>
  <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>Dynamic as</h1>
  <p>Open the browser console to see the current <code>as</code> value on the preload link.</p>
  <p class=hint>Valid values include <code>script</code>, <code>style</code>, <code>font</code>, <code>image</code>, and others.</p>
  <script>var link=document.getElementById("dynamicLink");link.setAttribute("as","script"),console.log('The "as" attribute is set to:',link.getAttribute("as"))</script>
</body>
</html>

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HTML as Attribute — Dynamic JavaScript