Definition and Usage
The onoffline attribute fires when the browser starts to work offline.
Tip: The onoffline attribute is the opposite of the ononline attribute.
Applies to
The onoffline attribute is part of the Event Attributes, and can be used on the following element:
| Elements | Event |
|---|---|
| <body> | onoffline |
Body Example
Execute a JavaScript when the browser starts to work offline:
<body onoffline="myFunction()">
Try it Yourself »
Browser Support
The numbers in the table specify the first browser version that fully supports the event attribute.
| Event Attribute | |||||
|---|---|---|---|---|---|
| onoffline | Not supported | Deprecated as of IE11 8.0 |
3.0 | Not supported | Not supported |