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DOM : Making a carousel - js part

<!DOCTYPE html>

<head>
  <meta charset="utf-8">
  <link rel="stylesheet" href="style.css">
</head>

<body>
 
<div id="carousel" class="carousel">
  <!--MIN : make a div which wrapps all image and buttons-->
  <button class="arrow prev">⇦</button>
  <div class="gallery">
<!-- MIN : now gallery is a div wrapping all images -->
  <ul>
    <li><img src="https://en.js.cx/carousel/1.png"></li>
    <li><img src="https://en.js.cx/carousel/2.png"></li>
    <li><img src="https://en.js.cx/carousel/3.png"></li>
    <li><img src="https://en.js.cx/carousel/4.png"></li>
    <li><img src="https://en.js.cx/carousel/5.png"></li>
    <li><img src="https://en.js.cx/carousel/6.png"></li>
    <li><img src="https://en.js.cx/carousel/7.png"></li>
    <li><img src="https://en.js.cx/carousel/8.png"></li>
    <li><img src="https://en.js.cx/carousel/9.png"></li>
    <li><img src="https://en.js.cx/carousel/10.png"></li>
  </ul>
</div>

<!-- MIN : put the right button to the end of carousel div-->
  <!-- MIN : add class detail to each directing arrow,
  prev and next for positioning-->
  <button class="arrow next">⇨</button>
</div>

  <script>
   
    let i = 1;
    for(let li of carousel.querySelectorAll('li')) {
      li.style.position = 'relative';
      li.insertAdjacentHTML('beforeend', `<span style="position:absolute;left:0;top:0">${i}</span>`);
      i++;
    }

    /*copying configuration*/
    let width = 130; // image width
    let count = 3;
   
    let list = carousel.querySelector('ul');
    let listElems = carousel.querySelectorAll('li');
   
    let position = 0; //ribbon scroll position
    //is left start point of the carousel
   
    carousel.querySelector('.prev').onclick = function(){
      position += width*count;
      //the button does not work if it goes negative
      position = Math.min(position, 0);
      list.style.marginLeft = position + 'px';
    };
   
    carousel.querySelector('.next').onclick = function() {
      //shift left
      position -= width * count; // 3 pics are shown in the carousel
                //each picture's width is 130
                //it moves the lineblock of images each time as the length of 3 images
      position = Math.max(position, -width * (listElems.length - count));
              //listElem.length is the number of images in the list
              //listElem.length - count abstracts scrolled number of images EACH TIME
              //-width * (listElems.length - count)) calculates the total WIDTH OF IMAGES
              //between the position and total width of scrolled image, bigger one got to saved by Math.max
      list.style.marginLeft = position + 'px';
          //marginLeft decides the leftest point of the scroll
    };
   
  </script>

</body>
</html>
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