电子邮件地址锁定在字段框中？

So I dont know what it is called but I am looking for a way to box in the user entered email addresses like they do in hotmail, where any valid email is boxed into that rectangle locked email once it is validated in real time? Also in hotmail they allow you to remove it by clicking the X and edit it by clicking the edit icon. I want to add more features also appart from edit and delete, so I guess I use AJAX for this? I dont know the term for this so not sure how to search for sample code and design patters for this. Any idea on what this is called or sample links with different design patterns?So I dont know what it is called but I am looki