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<!DOCTYPE html> <html> <body onresize="myFunction()"> <p>Try to resize the browser window to display the windows height and width.</p> <p id="demo"></p> <p><strong>Note:</strong> this example will not work properly in IE8 and earlier. IE8 and earlier do not support the outerWidth/outerHeight propery of the window object.</p> <script> function myFunction() { var w = window.outerWidth; var h = window.outerHeight; var txt = "Window size: width=" + w + ", height=" + h; document.getElementById("demo").innerHTML = txt; } </script> </body> </html>