Bootstrap Snippet Anirudha Bhowmik comparision slider using HTML CSS Javascript

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class=".img-comp-container">
  <div class=".img-comp-img">
    <img src="images/achievement.png" width="300" height="200">
  </div>
  <div class=".img-comp-img img-comp-overlay">
    <img src="images/banner1.jpg" width="300" height="200">
  </div>
</div>
<script>
/*Execute a function that will execute an image compare function for each element with the img-comp-overlay class:*/
initComparisons();
</script>
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* {box-sizing: border-box;}
.img-comp-container {
  position: relative;
  height: 200px; /*should be the same height as the images*/
}
.img-comp-img {
  position: absolute;
  width: auto;
  height: auto;
  overflow:hidden;
}
.img-comp-img img {
  display:block;
  vertical-align:middle;
}
.img-comp-slider {
  position: absolute;
  z-index:9;
  cursor: ew-resize;
  /*set the appearance of the slider:*/
  width: 40px;
  height: 40px;
  background-color: #2196F3;
  opacity: 0.7;
  border-radius: 50%;
}
.img-comp-overlay{
   background-color: aqua;
}
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function initComparisons() {
  var x, i;
  /*find all elements with an "overlay" class:*/
  x = document.getElementsByClassName("img-comp-overlay");
  for (i = 0; i < x.length; i++) {
    /*once for each "overlay" element:
    pass the "overlay" element as a parameter when executing the compareImages function:*/
    compareImages(x[i]);
  }
  function compareImages(img) {
    var slider, img, clicked = 0, w, h;
    /*get the width and height of the img element*/
    w = img.offsetWidth;
    h = img.offsetHeight;
    /*set the width of the img element to 50%:*/
    img.style.width = (w / 2) + "px";
    /*create slider:*/
    slider = document.createElement("DIV");
    slider.setAttribute("class", "img-comp-slider");
    /*insert slider*/
    img.parentElement.insertBefore(slider, img);
    /*position the slider in the middle:*/
    slider.style.top = (h / 2) - (slider.offsetHeight / 2) + "px";
    slider.style.left = (w / 2) - (slider.offsetWidth / 2) + "px";
    /*execute a function when the mouse button is pressed:*/
    slider.addEventListener("mousedown", slideReady);
    /*and another function when the mouse button is released:*/
    window.addEventListener("mouseup", slideFinish);
    /*or touched (for touch screens:*/
    slider.addEventListener("touchstart", slideReady);
    /*and released (for touch screens:*/
    window.addEventListener("touchstop", slideFinish);
    function slideReady(e) {
      /*prevent any other actions that may occur when moving over the image:*/
      e.preventDefault();
      /*the slider is now clicked and ready to move:*/
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"Anirudha Bhowmik comparision slider"
Bootstrap 4.1.1 Snippet by anirudhabhowmik

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"Anirudha Bhowmik comparision slider" Bootstrap 4.1.1 Snippet by anirudhabhowmik

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Questions / Comments:

"Anirudha Bhowmik comparision slider"
Bootstrap 4.1.1 Snippet by anirudhabhowmik