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HTML

HTMLHTML

HTML

<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title></title>
</head>
<body>
<h1></h1>
<p></p>
</body>
</html>

<h1></h1>
<p></p>
<button onclick="alert('')"></button>

CSS

CSS
CSS
```
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f0f0f0;
}
h1 {
    color: #333;
    text-align: center;
}
p {
    line-height: 1.6;
    color: #666;
}
```
CSS

body { font-family: Arial, sans-serif; margin: 20px; background-color: #f5f5f5; } h1 { color: #dc3545; text-align: center; } p { line-height: 1.6; color: #333; padding: 10px; background: white; border-radius: 5px; }

CSS

JavaScript

document.getElementById('myButton').addEventListener('click', function() {
alert('');
});

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