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<!DOCTYPE html> <html> <body> <p>Click the button to display the port number of the current URL.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <p><b>Note:</b> If the port number is 80 (which is the default port number), some browsers will display 0 or nothing.</p> <script> function myFunction() { var x = "Port: " + location.port; document.getElementById("demo").innerHTML = x; } </script> </body> </html>