Bootstrap Snippet draw a svg on scroll 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="container">
    <div class="row">
    <h1>Scroll down this page to draw a triangle.</h1>
<p>Scroll back up to reverse the drawing.</p>
<svg id="mySVG">
  <path fill="none" stroke="red" stroke-width="3" id="triangle" d="M150 0 L75 200 L225 200 Z" />
  Sorry, your browser does not support inline SVG.
</svg>
    
    
    
    </div>
</div>
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body {
  height: 3000px;
}
#mySVG {
  position: fixed;
  top: 30%;
  width: 400px;
  height: 210px;
}
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// Get the id of the <path> element and the length of <path>
var triangle = document.getElementById("triangle");
var length = triangle.getTotalLength();
// The start position of the drawing
triangle.style.strokeDasharray = length;
// Hide the triangle by offsetting dash. Remove this line to show the triangle before scroll draw
triangle.style.strokeDashoffset = length;
// Find scroll percentage on scroll (using cross-browser properties), and offset dash same amount as percentage scrolled
window.addEventListener("scroll", myFunction);
function myFunction() {
var scrollpercent = (document.body.scrollTop + document.documentElement.scrollTop) / (document.documentElement.scrollHeight - document.documentElement.clientHeight);
  var draw = length * scrollpercent;
  
  // Reverse the drawing (when scrolling upwards)
  triangle.style.strokeDashoffset = length - draw;
}
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"draw a svg on scroll "
Bootstrap 4.1.1 Snippet by ALIMUL AL RAZY

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"draw a svg on scroll " Bootstrap 4.1.1 Snippet by ALIMUL AL RAZY

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Questions / Comments:

"draw a svg on scroll "
Bootstrap 4.1.1 Snippet by ALIMUL AL RAZY