영상
개념
<!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>querySelector()</title>
</head>
<body>
<div>
<!-- <p style="border: 1px solid black;">div안의 p태그</p> -->
<p>div안의 p태그</p>
</div>
<p>p태그</p>
<script>
let element = document.querySelector("div > p");
// 테두리 변경
element.style.border = "1px solid black";
</script>
</body>
</html>
Java
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