复选框允许用户在回答一个问题时选择一个或多个选项
<!DOCTYPE html>
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<html>
<head>
<title>TODO supply a title</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<div>选择正确选项</div>
<form action="http:/www.example.comprofile,php">
<p>
<br />
<input type="checkbox" name="service" value="itunes" checked="checked" />第一个
<input type="checkbox" name="service" value="lastfm" />第二个
<input type="checkbox" name="service" value="spotify" />第三个
</p>
</form>
</body>
</html>