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<!DOCTYPE html> <html> <body> <p>This example uses the addEventListener() method to attach a "online" and "offline" event to the window object.</p> <p>Open the File menu and click on "Work Offline" to toggle between working online and offline.</p> <p><strong>Note:</strong> The ononline and onoffline events are only supported in Firefox and Internet Explorer version 8 to 10.</p> <script> window.addEventListener("online", onFunction); window.addEventListener("offline", offFunction); function onFunction() { alert ("Your browser is working online."); } function offFunction() { alert ("Your browser is working offline."); } </script> </body> </html>