<textarea>元素用来创建多行文本框。与其他input元素不同，<textarea>元素并非空元素，因此它包含起始标签和结束标签。

<!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/comments.php">
            <p>标题</p>
            <textarea name="comments"cols="20" rows="4">预设的消息</textarea>
        </form>
    </body>
</html>