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- The onoffline attribute triggers when the browser starts work offline.
Syntax for onoffline attribute in HTML:
<element onoffline="script">Difference between HTML 4.01 and HTML 5 for onoffline Attribute:
HTML 4.01
- HTML 4 does not support onoffline attribute.
HTML 5
- HTML 5 supports onoffline attribute.
Applies To:
| Element | Attribute |
|---|---|
| <body> | onoffline |
onoffline Attribute Value:
| Value | Description |
|---|---|
| script | The script to be run on onoffline |
Sample Coding for onoffline Attribute in HTML:
Tryit<!DOCTYPE html>
<html>
<head>
<title>Wikitechy onoffline attribute</title>
</head>
<body onoffline="offline()">
<h2>Goto file menu and click “Work Offline”</h2>
<p>
Learn to Code in Wikitechy<br>
Teach people how different technologies are organized<br>
<b>Note:</b>onoffline only supported in Firefox and
Internet Explorer version 8 to 10.</p>
<script>
function offline()
{
alert ("You are working in offline.");
}
</script>
</body>
</html>Code Explanation for onoffline Attribute in HTML:
- onoffline attribute used to trigger an event when the browser starts working in offline.
- offline JavaScript function used to show an alert message “You are working in offline.”
Output for onoffline Attribute in HTML:
- Goto File menu in the browser and chose “Work Offline”.
- The Window shows an alert message “You are working in offline.”
Browser Support for onoffline Attribute in HTML:
 |
 |
 |
 |
 |
|---|---|---|---|---|
| No | 8.0-10.0 | 3.0 | No | No |
Tips and Notes
- onoffline attribute only supported in Firefox and Internet Explorer version 8 to 10.