Tryit Editor v3.6

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
ul, #myUL {
  list-style-type: none;
}

#myUL {
  margin: 0;
  padding: 0;
}

.caret {
  cursor: pointer;
  -webkit-user-select: none; /* Safari 3.1+ */
  -moz-user-select: none; /* Firefox 2+ */
  -ms-user-select: none; /* IE 10+ */
  user-select: none;
}

.caret::before {
  content: "\25B6";
  color: black;
  display: inline-block;
  margin-right: 6px;
}

.caret-down::before {
  -ms-transform: rotate(90deg); /* IE 9 */
  -webkit-transform: rotate(90deg); /* Safari */'
  transform: rotate(90deg);  
}

.nested {
  display: none;
}

.active {
  display: block;
}
</style>
</head>
<body>

<h2>Tree View</h2>
<p>A tree view represents a hierarchical view of information, where each item can have a number of subitems.</p>
<p>Click on the arrow(s) to open or close the tree branches.</p>

<ul id="myUL">
  <li><span class="caret">Beverages</span>
    <ul class="nested">
      <li>Water</li>
      <li>Coffee</li>
      <li><span class="caret">Tea</span>
        <ul class="nested">
          <li>Black Tea</li>
          <li>White Tea</li>
          <li><span class="caret">Green Tea</span>
            <ul class="nested">
              <li>Sencha</li>
              <li>Gyokuro</li>
              <li>Matcha</li>
              <li>Pi Lo Chun</li>
            </ul>
          </li>
        </ul>
      </li>  
    </ul>
  </li>
</ul>

for (i = 0; i < toggler.length; i++) {
  toggler[i].addEventListener("click", function() {
    this.parentElement.querySelector(".nested").classList.toggle("active");
    this.classList.toggle("caret-down");
  });
}
</script>

</body>

</html>

​x
 
<!DOCTYPE html><html><head><meta name="viewport" content="width=device-width, initial-scale=1"><style>ul, #myUL {  list-style-type: none;}​#myUL {  margin: 0;  padding: 0;}​.caret {  cursor: pointer;  -webkit-user-select: none; /* Safari 3.1+ */  -moz-user-select: none; /* Firefox 2+ */  -ms-user-select: none; /* IE 10+ */  user-select: none;}​.caret::before {  content: "\25B6";  color: black;  display: inline-block;  margin-right: 6px;}​.caret-down::before {  -ms-transform: rotate(90deg); /* IE 9 */  -webkit-transform: rotate(90deg); /* Safari */'  transform: rotate(90deg);  }​.nested {  display: none;}​.active {  display: block;}</style></head><body>​<h2>Tree View</h2>

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