There is. If you get named "RetryName" your name was too long. I believe the limit is 20 characters.
you can fix that with javascript alone, why wouldn't you? it would be very simple, and if they went around the JS to try to use a longer name anyway, you can just keep using the same "RetryName" thing, because people will probably never see it
also I wish people would stop saying "HTML5"
it's so buzzwordy