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

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

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