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HTML | onoffline Event Attribute
  • Difficulty Level : Basic
  • Last Updated : 13 Oct, 2020

The onoffline event attribute works when the browser work in offline mode. It is supported by <body> tag only. It is an opposite of ononline event attribute.

Syntax: 

<element onoffline = "script">


Attribute Value: The script event is run when onoffline attribute is called.

Example:  

HTML




<!DOCTYPE html>
<html>
    <head>
        <title>onoffline event attribute</title>
        <style>
            h1 {
                color:green;
            }
            body {
                text-align:center;
            }
        </style>
    </head>
    <body onoffline = "gfg()">
        <h1>GeeksforGeeks</h1>
        <h2>onoffline Event Attribute</h2>
        <script>
            function gfg() {
                alert ("Browser working in offline mode");
            }
        </script>
    </body>
</html>                   

Output: 



onffline event

Supported Browsers: The browser supported by onoffline event attribute are listed below: 

  • Firefox 3.0
  • Internet Explorer 8.0

 

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