<!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>