고정 헤더 영역
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<!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">
<script>
window.addEventListener("load",()=>{
const box = document.querySelector(".box");
box.style.background = "gold";
})
</script>
<title>Title</title>
<style>
.box{
width : 100px;
height: 100px;
background-color: red;
}
</style>
</head>
<body>
<div class="box"></div>
</body>
</html>
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