index2.html

<!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>Document</title>
</head>
<body>
    <h1 id="heading">Welcome to DOM</h1>
    <p id="para">Lorem ipsum dolor sit amet consectetur adipisicing elit. Ipsa soluta esse vero corrupti deserunt est iste, dicta laudantium, consectetur sit nobis quam saepe repudiandae tempora mollitia sed dignissimos officia molestias.</p>
    <button>Button</button>
    <p class="para-class" > Lorem ipsum dolor sit amet consectetur adipisicing elit. Nulla eos sint rerum nam culpa esse labore aliquam pariatur illo doloremque. Est eum fuga vero labore! Porro similique dolorum fugiat. Perferendis!</p>
    <script src="dom-manulation1.js"></script>
</body>
</html>