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JS Timing

A script on this page starts this clock:

// set the myTimer() interval to 1000 milliseconds or 1 second
setInterval(myTimer, 1000);

// defines myTimer() function
function myTimer() {
  const d = new Date();
  document.getElementById("demo").innerHTML = d.toLocaleTimeString();
}

There are 1000 milliseconds in one second.