x
<html><body><h1>The Window Location Object</h1><h2>The port Property</h2><p id="demo"></p><p><b>Note: </b>If the port number is default (80 for http and 443 for https), most browsers return nothing.</p><script>let port = location.port;document.getElementById("demo").innerHTML = "The port number of the current page is: " + port;</script></body></html>