HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>body.append live page</title>
  <style>body{font-family:system-ui,sans-serif;margin:1rem;}</style>
</head>
<body>
  <div id="host">Host:</div>
  <pre id="out"></pre>
  <script>
    var p = document.createElement("p");
    p.textContent = "Added to the page";
    document.body.append(p);
    document.getElementById("out").textContent =
      "paragraph in body: " + document.body.contains(p);
  </script>
</body>
</html>

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Document.append — body.append on live page (Try It)