使用HTML 5和pattern属性时，如何将输入内容限制为仅英文字母？

Question

Everytime I try to validate a pattern in an input tag (text), so far in FireFox and Chrome, it does not work. It does not work on any page. Neither the restriction on the character input, nor the number of characters works. I know I can use JavaScript. I want to make it work with HTML 5, using the pattern attribute. Am I doing it wrong? Was it removed from the standard?

Example,

http://www.wufoo.com/html5/attributes/10-pattern.html http://www.w3schools.com/tags/att_input_pattern.asp

or my own,

 <form id="request" action="mypage.php" method="POST"> <fieldset> <legend>Request Form</legend> <label for="first-name">First Name</label> <input type="text" placeholder="First Name" name="first-name" id="first-name" pattern="^/[A-Za-z]{3}/$" title="Enter First Name" size="20"> </fieldset> </form> 

I have also tried,

pattern="[A-Za-z]{3}"
pattern="[A-Z][a-z]{20}"
pattern="^[A-Za-z]{3}$"

and others.

Answer 1

I got it. My problem was I expected it to die before I hit submit. I forgot you it doesn't react like JavaScript and the keyevent.