continue count down after refresh

The counter works properly but starts again after refresh
How can I continue after refreshing the counter?

function startTimer(duration, display) {
    var timer = duration, minutes, seconds;
    setInterval(function () {
        minutes = parseInt(timer / 60, 10);
        seconds = parseInt(timer % 60, 10);
  
        minutes = minutes < 10 ? "0" + minutes : minutes;
        seconds = seconds < 10 ? "0" + seconds : seconds;
  
        display.textContent = minutes + ":" + seconds;
  
        if (--timer < 0) {
            timer = duration;
        }
    }, 1000);
  }
  
  window.onload = function () {
    var duration = 60 * 2,
        display = document.getElementById("timer");
    startTimer(duration, display);
  };

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