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<!DOCTYPE html> <html> <body> <iframe id="myFrame" src="../default.html" height="200" width="250"></iframe> <p>Click the button to change the height and width of the iframe to 400px.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { document.getElementById("myFrame").height = "400"; document.getElementById("myFrame").width = "400"; } </script> </body> </html>