x
<html><body><iframe id="myFrame" srcdoc="<p>Hello world!</p>" src="demo_iframe.htm"></iframe><p>Click the button to display the HTML content that is shown in the iframe.</p><button onclick="myFunction()">Try it</button><p id="demo"></p><script>function myFunction() { var x = document.getElementById("myFrame").srcdoc; document.getElementById("demo").innerHTML = x;}</script></body></html>