The offline event is fired when the browser has lost access to the network and the value of navigator.onLine switched to false.
<window>)| Property | Type | Description |
|---|---|---|
target Read only
| EventTarget | The event target (the topmost target in the DOM tree). |
type Read only
| DOMString | The type of event. |
bubbles Read only
| Boolean | Whether the event normally bubbles or not. |
cancelable Read only
| Boolean | Whether the event is cancellable or not. |
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https://developer.mozilla.org/en-US/docs/Web/Events/offline