Edit This Code:
<!DOCTYPE html>
<html>
<body>

<iframe src="../default.asp.html" style="height:400px;width:650px;"></iframe>

<div id="myDIV">
  <span id="mySpan" style="font-size:35px;">A Span element</span>
</div>

<p>Click one button to remove the span element from its parent. Click the other button to insert the removed span element into the other document's h1 element (the new parent).</p>

<button onclick="removeLi()">Remove span</button>
<button onclick="myFunction()">Insert span</button>

<script>
var child = document.getElementById("mySpan");

function removeLi() {
    child.parentNode.removeChild(child);
}

function myFunction() {
    var frame = document.getElementsByTagName("IFRAME")[0]
    var h = frame.contentWindow.document.getElementsByTagName("H1")[0];
    var x = document.adoptNode(child);
    h.appendChild(x);
}
</script>

</body>
</html>


Result:
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