HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>language — dynamic legacy</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}button{padding:.5rem 1rem;font:inherit;cursor:pointer;border-radius:6px;border:1px solid #cbd5e1;background:#fff}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:520px}</style>

</head>

<body>

  <h1>setAttribute("language", ...)</h1>

  <button type=button id=runScript>Run legacy-style inject</button>

  <script>document.getElementById("runScript").addEventListener("click",(function(){var t=document.createElement("script");t.setAttribute("language","javascript"),t.textContent="alert('Injected without needing language attribute.');",document.body.appendChild(t)}))</script>

  <p class=hint>Omit <code>setAttribute("language", ...)</code>. Append the script with <code>textContent</code> or <code>src</code> only.</p>

</body>

</html>

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HTML language Attribute — Dynamic Legacy Pattern