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HTML | Navigator userAgent Property
  • Last Updated : 26 Jul, 2019

The Navigator userAgent property is used for returning the user-agent header’s value sent to the server by the browser. It returns a string representing values such as the name, version, and platform of the browser.



Below program illustrates the Navigator userAgent Property:

<!DOCTYPE html>
      Navigator userAgent Property in HTML
        h1 {
            color: green;
        h2 {
            font-family: Impact;
        body {
            text-align: center;
    <h2>Navigator userAgent Property</h2>
      For checking the browser's User-agent header name,
      double click the "Check User Agent" button: 
    <button ondblclick="checkua()">
      Check User Agent
    <p id="header"></p>
        function checkua() {
            var u = 
                "User-agent header sent by the browser : " 
                                     + navigator.userAgent;
            document.getElementById("header").innerHTML = u;


After clicking the button

Supported Browsers: The browser supported by Navigator userAgent are listed below:

  • Google Chrome
  • Internet Explorer
  • Firefox
  • Opera
  • Safari

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