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<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8">
<title>JavaScript入門</title>
</head>
<body>
<header class="header">
アラート表示
</header>
<script>
alert("hello!");
</script>
<section class="contents">
</section>
<script>
</script>
</body>
</html>
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