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<!DOCTYPE html> <html> <body> <iframe src="../../www.cnn.com/index.html"></iframe> <iframe src="../../www.bbc.com/index.html"></iframe> <iframe src="../../www.nytimes.com/index.html"></iframe> <p>Click the button to get the number of frames found on this page.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = window.length; document.getElementById("demo").innerHTML = x; } </script> </body> </html>