Many modern keyboards are wireless and do not provide a light to indicate if CAPSLOCK is on or off. If CAPSLOCK is on unintentionally, then the correctly typed keys will not result in the correct password. This can get pretty frustrating if you do not know why it is happening.
Suggest to code CAPSLOCK detection into our log in pages in order to assist users in entering the correct password. Detection of CAPSLOCK should just result in a toast message that informs the user of this fact (perhaps without a timeout)
Link to tech discussion on the topic: http://stackoverflow.com/a/34277417