HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>append meta</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var meta = document.createElement("meta");
    meta.name = "description";
    meta.content = "Added from JavaScript via document.head";
    document.head.appendChild(meta);
    document.getElementById("out").textContent =
      document.head.querySelector('meta[name="description"]').content;
  </script>
</body>
</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

Append meta to head (Try It)