window.navigator.onLine is the simplest approach to return the online status of the browser. It is not guaranteed to be accurate. Most implementations of the API watch for changes in the local network interface to determine if your application is online or not. But what if your network interface is up, but your router is down ??. window.navigator.onLine will return true and it means that you are online and that is WRONG. To handle that case we make XMLHttpRequest and listen to change in the network state by events window.ononline and window.onoffline to be notified immediately ?
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