<!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="dog">Hello</h1>
<h1 id="cat">초보</h1>
</body>
<script>
document.getElementById('dog').innerHTML = '안녕'
document.getElementById('dog').style.fontSize = '16px'
document.getElementById('dog').src = 'dog.jpg'
document.getElementById('cat').innerHTML = '고수'
document.getElementById('cat').style.color = 'blue'
document.getElementById('cat').style.fontSize='20px'
</script>
</html>
