JAVASCRIPT Add/Remove class

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>JAVASCRIPT Add/Remove class</title>
  <style>

    .divDefault {
      border: 5px solid red;
      padding: 10px;
      background-color: green;
      color: snow;
      display: inline-block;
      font-size: 20px;
      font-family: arial black;
      cursor: context-menu;
    }

    .divNewClass {
      padding: 10px 50px;
      background-color: red;
      color: snow;
      display: inline-block;
      font-size: 50px;
      font-family: arial black;
      cursor: pointer;
    }
  </style>
</head>

<body>

  <div onclick='changeDefault()' class="divDefault">I am a DIV element</div>

  <script>
    x = document.getElementsByClassName("divDefault")[0];
    toggle = true;

    function changeDefault() {
      if (toggle) {
        x.classList.add("divNewClass");
        x.innerHTML = 'This is the new me!';
        toggle = false;
      } else if (toggle == false) {
        x.classList.remove("divNewClass");
        x.innerHTML = 'I am a DIV element';
        toggle = true;
      }
    }
  </script>
</body>

</html>