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<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> </head> <body> <p id="demo"></p> <button onclick="clearInterval(myVar)">Stop time</button> <script> var myVar = setInterval(function () {myTimer()}, 1000); function myTimer() { var d = new Date(); document.getElementById("demo").innerHTML = d.toLocaleTimeString(); } </script> </body> </html>
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