现场演示：我的 HTML 文档

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>Example of CSS font property</title>
    <style>
        h1 {
            font: bold 2.5em "Times New Roman", Times, serif;
        }
        p {
            font: normal 1.2em Arial, Helvetica, sans-serif;
        }
    </style>
</head>
<body>
    <h1>This is a heading</h1>
    <p>This is a paragraph.</p>
</body>
</html> 