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<html><body><h1>HTML DOM Events</h1><h2>The ononline Event</h2><p>Use the addEventListener() method to attach a "online" and "offline" event to the window object.</p><p><b>NOTE:</b> There will only be an "output" from this example when the browser shifts from offline to online.</p><p id="demo"></p><script>window.addEventListener("online", onFunction);window.addEventListener("offline", offFunction);function onFunction() { document.getElementById("demo").innerHTML = "Your browser is working online.";}function offFunction() { document.getElementById("demo").innerHTML = "Your browser is working offline.";}</script></body></html>