大写：This is some text in a paragraph.
小写：This is some text in a paragraph.
第一个字母大写：This is some text in a paragraph.
以下是这个网页的代码：
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css">
h1 {text-transform: uppercase}
p.uppercase {text-transform: uppercase}
p.lowercase {text-transform: lowercase}
p.capitalize {text-transform: capitalize}
</style>
</head>
<body>
<h1>看这句英文：This Is An H1 Element</h1>
<p class="uppercase">大写：This is some text in a paragraph.</p>
<p class="lowercase">小写：This is some text in a paragraph.</p>
<p class="capitalize">第一个字母大写：This is some text in a paragraph.</p>
</body>
</html>