<!-- <head> 등의 태그는 편의상 생략 -->
<body>
  <ul>
    <li class="list-item">Item 1</li>
    <li class="list-item">Item 2</li>
    <li class="list-item">Item 3</li>
  </ul>
  <input type="text" value="default txt" />
</body>
// DOM 탐색 프로퍼티 방식
const ul = document.body.firstElementChild.nextElementSibling;
const firstLi = ul.firstElementChild;

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