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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> var timeoutID; function delayedAlert() { timeoutID = setTimeout(showAlert, 2000); } function showAlert() { alert('This is a JavaScript alert box.'); } function clearAlert() { clearTimeout(timeoutID); } </script> <button onclick="delayedAlert();">Show Alert After Two Seconds</button> <button onclick="clearAlert();">Cancel Alert Before It Display</button> </body> </html>