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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/Window/offline_event below:

Window: offline event - Web APIs

Window: offline event

Baseline Widely available

The offline event of the Window interface is fired when the browser has lost access to the network and the value of Navigator.onLine switches to false.

Syntax

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("offline", (event) => { })

onoffline = (event) => { }
Event type

A generic Event.

Event handler aliases

In addition to the Window interface, the event handler property onoffline is also available on the following targets:

Examples
// addEventListener version
window.addEventListener("offline", (event) => {
  console.log("The network connection has been lost.");
});

// onoffline version
window.onoffline = (event) => {
  console.log("The network connection has been lost.");
};
Specifications Browser compatibility See also

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