HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>Link and Script Example</title>

  <style>body{font-family:system-ui,sans-serif;margin:1.5rem;color:#334155}#demo{color:#059669;font-weight:600}</style>

  <script>document.addEventListener("DOMContentLoaded",(function(){var e=document.getElementById("demo");e&&(e.textContent="JavaScript loaded from head!")}))</script>

</head>

<body>

  <h1>CSS and JS from head</h1>

  <p id=demo>Waiting for script...</p>

</body>

</html>

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HTML head Tag — Link CSS and JavaScript