Block level help text for form controls.
<!DOCTYPE HTML>
<html>
<head>
<link href="http://java2s.com/style/bootstrap.min.css" rel="stylesheet">
</head><!--from ww w.j a va 2 s . c o m-->
<body style='margin:20px;'>
<span class="help-block">A block of help text that
breaks onto a new line and may extend beyond one line.
</span>
</body>
</html>