html5-textarea元素

<!DOCTYPE html>
<html lang="en">
<head>
   <meta charset="UTF-8">
   <title>textarea元素</title>
</head>
<body>
<form action="" id="my">
   user:<input type="text" size="30"><br>
   意见：<textarea rows="30" cols="90" placeholder="输入内容"></textarea>
</form>
</body>
</html>