03 - Hello World.html

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

<head>
  <meta charset="UTF-8">
  <title>Getting Started with JavaScript</title>

  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.1/dist/css/bootstrap.min.css">
  <style>
    body {
      padding: 30px;
    }
  </style>
</head>

<body>

  <div class="jumbotron text-center">
    <h1>This is my site!</h1>

    <button type="button" class="btn btn-primary" onclick="changeText()">
      Change the Text
    </button>
  </div>

  <!-- 🔥🔥🔥🔥 start javascript 🔥🔥🔥🔥 -->
  <script>
    const header = document.querySelector('h1');

    function changeText() {
      header.innerText = 'my new text!';
    }
  </script>
</body>

</html>