App下载
实例代码( Tip: 登录后体验更佳 )
<!DOCTYPE html>
<html>
<head>
<title>W3.CSS(w3cschool.cn)</title>
<meta name="viewport" content="width=device-width, initial-scale=1" charset="UTF-8">
<link rel="stylesheet" href="https://7npmedia.w3cschool.cn/w3.css">
</head>
<body>
<form class="w3-container w3-card-4" action="/action_page.php">
<h1></h1>
<select class="w3-select" name="option">
<option value="" disabled selected></option>
<option value="1"> 1</option>
<option value="2"> 2</option>
<option value="3"> 3</option>
</select>
<p><button class="w3-btn w3-teal"></button></p>
</form>
</body>
</html>
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运行结果