从文本框中删除文本时,文本框会出现红色边框。但是,textarea 不遵循这种行为。有什么问题,我该如何解决?
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="ISO-8859-1" />
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scaleable=no" />
<link rel="stylesheet" href="http://code.jquery.com/mobile/1.3.2/jquery.mobile-1.3.2.min.css">
<script src="http://code.jquery.com/jquery-1.9.1.min.js"></script>
<script src="http://code.jquery.com/mobile/1.3.2/jquery.mobile-1.3.2.min.js"></script>
</head>
<body>
<div data-role="page" id="page_1" data-theme="b">
<div data-role="content" data-theme="b" style="padding:0px;margin:0;">
<p>Content Page 1</p>
<form name="contactForm" id="contactForm" data-ajax="false" method="post">
<div>
<input type="text" id="name" name="name" value="" required="true"></input>
</div>
<div>
<input id="email" name="email" type="email" value="" required="true"></input>
</div>
<div>
<textarea name="message" id="message" required="true"></textarea>
</div>
<div>
<input type="submit" name="submit" id="submit" value="Submit"></input>
</div>
</form>
</div>
</div>
</body>
</html>