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实例代码( Tip: 登录后体验更佳 )
运行代码 
<!DOCTYPE html>
<html>
<head> 
<meta charset="utf-8"> 
<title>W3Cschool(w3cschool.cn)</title> 
</head>
<body>
<form action="/statics/demosource/demo-form.php" method="get" id="form1">
你喜欢的颜色是什么？<input type="text" name="fav_color"><br>
<input type="submit">
</form>
<p>下面的自定义字段在表单外,但仍是表单的一部分。</p>
<fieldset form="form1">
  <legend>个人信息:</legend>
  姓名: <input type="text" name="username"><br>
  邮箱: <input type="text" name="usermail"><br>
</fieldset>
<p><b>注意：</b>目前，只有 Opera 支持 form 属性。</p>
</body>
</html>
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运行结果
PC端 手机端 平板端