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<html><body><h2>JavaScript</h2><h3>The window.location object</h3><p id="demo"></p><p><b>Note: </b>If the port number is default (80 for http and 443 for https), most browsers will display 0 or nothing.</p><script>document.getElementById("demo").innerHTML = "The URL port number of the current page is: " + window.location.port;</script></body></html>