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<!DOCTYPE html> <html> <body> <iframe id="myframe" src="../default.html" height="200" width="250"> <p>Your browser does not support iframes.</p> </iframe> <p>Click the button to display the height of the iframe.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myframe").height; document.getElementById("demo").innerHTML = x; } </script> </body> </html>