HTML | Navigator onLine Property

The Navigator onLine property is used for returning a Boolean value which specifies whether a browser is in the online or offline mode.
It is a read-only property which returns true if the browser is in online mode or false if it is in the offline mode.



Below program illustrates the Navigator onLine Property :

Checking whether the browser is in the online or offline mode.





<!DOCTYPE html>
      Navigator onLine Property in HTML
        h1 {
            color: green;
        h2 {
            font-family: Impact;
        body {
            text-align: center;
    <h2>Navigator onLine Property</h2>
      For checking the browser's mode, 
      double click the "Check Mode" button: 
    <button ondblclick="checkmode()">
      Check Mode
    <p id="mode"></p>
        function checkmode() {
            // We use navigator.onLine to check if browser is online
            var o = 
                "Is the browser in online mode? " + navigator.onLine;
            document.getElementById("mode").innerHTML = o;



After clicking the button

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

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

My Personal Notes arrow_drop_up

I am a technology enthusiast who has a keen interest in programming I am pursuing Engineering in Computer Science from GEU, Dehradun I like to unwind by watching movies and English sitcomsI have a keen interest in music

If you like GeeksforGeeks and would like to contribute, you can also write an article using or mail your article to See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.

Article Tags :
Practice Tags :

Be the First to upvote.

Please write to us at to report any issue with the above content.