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HTML | Navigator userAgent Property

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  • Difficulty Level : Hard
  • Last Updated : 10 Aug, 2022
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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.



Return Value: A String, representing the user agent string for the current 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;

Before clicking the button:

After clicking the button: 

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

  • Google Chrome 1
  • Edge 12
  • Internet Explorer 4
  • Firefox 1
  • Opera 12.1
  • Safari 1

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