HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>Dynamic codebase 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>Dynamic setAttribute</h1>
  <applet id=myApplet code=MyApplet.class width=200 height=100>
    Your browser does not support Java applets.
  </applet>
  <p class=hint>JavaScript sets <code>codebase</code> to <code>http://example.com/dynamic/</code> after the page loads.</p>
  <script>var appletElement=document.getElementById("myApplet");appletElement.setAttribute("codebase","http://example.com/dynamic/")</script>
</body>
</html>

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HTML codebase Attribute — Dynamic JavaScript