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