单选按钮

单选按钮只让用户从一系列选项中选择其中一个
<!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>TODO write content</div>
        <form action="http://www.example.com/profile.php">
            <p>选择其中一个:
                <br />
                <input type="radio" name="genre" value="rock" checked="checked" />第一个
                <input type="radio" name="genre" value="pop" />第二个
                <input type="radio" name="genre" value="jazz" />第三个
            </p>
        </form>
    </body>
</html>