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<!DOCTYPE html> <html> <body> <p>A script on this page starts this clock:</p> <p id="demo"></p> <button onclick="myStopFunction()">Stop time</button> <script> var myVar = setInterval(function(){ myTimer() }, 1000); function myTimer() { var d = new Date(); var t = d.toLocaleTimeString(); document.getElementById("demo").innerHTML = t; } function myStopFunction() { clearInterval(myVar); } </script> </body> </html>