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Very often while registering on a website ,you will notice that they usually have a username or email address availability check. This ensures that 2 users do not have the same username or email address. Some websites prefer to make this availability check when a user fill in all the details in the form and press submit while some other websites do a live username / Email Address Availability check when the “username” textbox loses focus. Personally, I would prefer to let the user know if a particular username is available while filling the registration form rather than after submitting the registration form.

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