<!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">
<title>Title</title>
<style>
</style>
</head>
<body>
<button onclick="alert(this.className.toLowerCase());" class="YEhHOE">HHAHAAH</button>
<button onclick="alert((function() { return this; })());">
내부 this 표시
</button>
</body>
</html>
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