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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>Javascript Replacing Existing Elements in DOM</title> </head> <body> <script> function goOnline() { // Action to be performed when your application goes online alert("And we're back!"); } function goOffline() { // Action to be performed when your application goes offline alert("Hey, it looks like you're offline."); } // Attaching event handler for the online event window.addEventListener("online", goOnline); // Attaching event handler for the offline event window.addEventListener("offline", goOffline); </script> <p>Toggle your internet connection on/off to see how it works.</p> </body> </html>