HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>Dynamic Meta content</title>
  <meta name=description content="Original description text.">
  <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}output{display:block;margin-top:.75rem;padding:.65rem .85rem;background:#fff;border:1px solid #e2e8f0;border-radius:6px;font-size:.875rem}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:480px}</style>
</head>
<body>
  <h1>Dynamic meta content</h1>
  <p>Current description meta value:</p>
  <output id=descOut></output>
  <script>var meta=document.querySelector('meta[name="description"]');meta&&(meta.content="New dynamic content!",document.getElementById("descOut").textContent=meta.content)</script>
  <p class=hint>Use <code>metaElement.content</code> or <code>setAttribute("content", "...")</code>. For visible page text, use <code>textContent</code> instead.</p>
</body>
</html>

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HTML content Attribute — Dynamic JavaScript