VS Code 사용시
1. ! + Tab 자동완성
2. <html lang="en"> 부분을 <html lang = 'ko">로 바꾸기
3. 완성!
<!DOCTYPE html>
<html lang="ko">
<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>
</body>
</html>