HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>importNode iframe</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} iframe{width:100%;height:80px;border:1px solid #ccc;} #container{border:1px dashed #888;padding:0.75rem;min-height:2rem;margin-top:0.75rem;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <iframe id="frame" srcdoc="<p id='myNode'>Hello from iframe</p>"></iframe>
  <button id="btn" type="button">Import from iframe</button>
  <div id="container"></div>
  <pre id="out">Wait for iframe, then click</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var iframe = document.getElementById("frame");
      var oldNode = iframe.contentWindow.document.getElementById("myNode");
      if (!oldNode) {
        document.getElementById("out").textContent = "iframe not ready";
        return;
      }
      var newNode = document.importNode(oldNode, true);
      document.getElementById("container").appendChild(newNode);
      var stillInIframe = !!iframe.contentWindow.document.getElementById("myNode");
      document.getElementById("out").textContent =
        "copied text: " + newNode.textContent +
        "\nsource still in iframe: " + stillInIframe;
    });
  </script>
</body>
</html>

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Document.importNode — iframe copy (Try It)