<!DOCTYPE html>
<head>
  <script src="include.js"></script>
  <style>
    .parent {
      font-size: 32px;
    }
    
    .child {
      font-size: 3em;
      width: 2em;
      height: 2em;
      color: blue;
      background-color: magenta;
    }
  </style>
</head>
<body>
  <div class="parent" id="parentElement">
    <p class="child">
      Hello!
    </p>
  </div>

  <script>
    function increaseParentSize() {
      document.getElementById('parentElement').style.fontSize = '100px';
    }

    test(() => 