Take the following situation:
You have been asked to assist with a username checker for a sites online registration. Usernames are now allowed to have more than 5 symbols and the username cannot contain more than 70% symbols. Usernames can be any length and do not have to contain symbols.
I need JavaScript code that can count the total number of symbols in each message (username) to ensure that it does not include more than 5 symbols, and detect if it is more than 70% of the message (username). This should include all symbols on a standard US keyboard.