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HTML onoffline Attribute


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 in IE11
8.0
3.0 Not supported Not supported