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<!DOCTYPE html> <html> <body> <button onClick="myTimer = setInterval(myCounter, 1000)">Start counter!</button> <p id="demo">Click on the button above and I will count forever.</p> <button onClick="clearInterval(myTimer)">Stop counter!</button> <script> var c = 0; function myCounter() { document.getElementById("demo").innerHTML = ++c; } </script> </body> </html>