How to resume progress at the same point of time where progress stopped

var progressStart = null, intervalId = null;

function timeUpdateCallback() {
       if (progressStart === null) {
          progressStart = performance.now();
        }
        const elapsed = performance.now() - progressStart;
        // const progress = (elapsed / duration) * 100;
        const currentTime = (elapsed / 1000); // Convert to seconds
        return currentTime;
 }

const range = document.getElementById("range");

const rangeWidth = range.offsetWidth;

console.log('rangeWidth',rangeWidth)

// https://stackoverflow.com/questions/10756313/javascript-jquery-map-a-range-of-numbers-to-another-range-of-numbers
const scale = (num, in_min, in_max, out_min, out_max) => {
  return ((num - in_min) * (out_max - out_min)) / (in_max - in_min) + out_min;
};

range.addEventListener("input", (e) => {
  const value = +e.target.value;
  const label = e.target.nextElementSibling;
  const rangeWidth = getComputedStyle(e.target).getPropertyValue("width");
  const labelWidth = getComputedStyle(label).getPropertyValue("width");
  // remove px
  const numWidth = +rangeWidth.substring(0, rangeWidth.length - 2);
  console.log('numWidth',numWidth);
  const numLabelWidth = +labelWidth.substring(0, labelWidth.length - 2);
  const max = +e.target.max;
  const min = +e.target.min;
  const left =
    value * (numWidth / max) -
    numLabelWidth / 2 +
    scale(value, min, max, 10, -10);
  label.style.left = `${left}px`;
  label.innerHTML = value;
});

function startProgress(){
  intervalId = setInterval(()=>{
   let p = timeUpdateCallback();
   console.log('p:',p)
  range.value = Math.floor(p * 1000 / rangeWidth);
  console.log(`range.value:`,range.value);
  if(range.value == 100){
    range.value = 0;
  }
  range.dispatchEvent(new Event('input'));
},400);  
}

startProgress();

document.getElementById('stop').addEventListener('click',()=>{
  console.log('stopped at:',range.value);
  clearInterval(intervalId);
})

document.getElementById('start').addEventListener('click',()=>{
  console.log('started at:',range.value);
  startProgress();
})

@import url("https://fonts.googleapis.com/css2?family=Lato&display=swap");

* {
  box-sizing: border-box;
}

body {
  background-image: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  font-family: "Lato", sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  overflow: hidden;
  margin: 0;
}

h2 {
  position: absolute;
  top: 10px;
}

.range-container {
  position: relative;
}

input[type="range"] {
  width: 300px;
  margin: 18px 0;
  -webkit-appearance: none;
}

input[type="range"]:focus,input[type="range"]:active {
  outline: none;
  cursor: grabbing !important;
}

input[type="range"] + label {
  background-color: #fff;
  position: absolute;
  top: -25px;
  left: 110px;
  width: 80px;
  padding: 5px 0;
  text-align: center;
  border-radius: 4px;
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.3);
}

/* Chrome & Safari */
input[type="range"]::-webkit-slider-runnable-track {
  background: transparent;
  border-radius: 4px;
  width: 100%;
  height: 10px;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  height: 120px;
  width: 2px;
  background: red;
  cursor: grab;
}


input[type="range"]::-webkit-slider-thumb::before {
  content: "";
  display: block;
  width: 20px;
  height: 20px;
  background-color: yellow;
  position: absolute;
  top: 30%;
  left: 30;
}

<h2>Custom Range Slider</h2>
    <div class="range-container">
      <input type="range" name="range" step="10" id="range" min="0" max="100" data-red="yellow"/>
      <label for="range">50</label>
    </div>

<button id="stop">Stop</button>
<button id="start">Start</button>