<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JS Bin</title>
</head>
<body>
<details>
<summary>아래 내용을 참조하세요 </summary>
<span>정답은 바로 이것입니다.</span>
</details>
</body>
</html>
span{
color:red;
background:yellow;
}
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