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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 checkConnectionStatus() { if(navigator.onLine) { alert("Application is online."); } else { alert("Application is offline."); } } </script> <button type="button" onclick="checkConnectionStatus();">Check Connection Status</button> </body> </html>