To make collapsible text in xaringan

I would like to implement a chunk of codes for collapsible text by following the codes from the weblink below.
W3Schools Tryit Editor.

The button part is shown, but the hidden content can't be opened up.

It looks like you may be missing some important parts of the code. In the example from W3Schools, the entire HTML, CSS, and JavaScript code is provided.

Here is the full code from the W3Schools example:

Copy code

<!DOCTYPE html>
.collapsible {
  background-color: #777;
  color: white;
  cursor: pointer;
  padding: 18px;
  width: 100%;
  border: none;
  text-align: left;
  outline: none;
  font-size: 15px;

.active, .collapsible:hover {
  background-color: #555;

.content {
  padding: 0 18px;
  display: none;
  overflow: hidden;
  background-color: #f1f1f1;

<button class="collapsible">Open Collapsible</button>
<div class="content">
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>

var coll = document.getElementsByClassName("collapsible");
var i;

for (i = 0; i < coll.length; i++) {
  coll[i].addEventListener("click", function() {
    var content = this.nextElementSibling;
    if ( ===

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