Form Character Limit Animation using jQuery and CSS

I was recently playing around with form validation and using css to animate cool things, but then I stumbled across character limit. You can easily use jQuery to access parameters like an input field’s character limit and current character limit. So I tried creating a simple animation that showed as you were typing in a field how many characters you had left. I opted for a simple design where there is just a grey bar underneath the input field and it fills up as you type in characters and changes colors as you get closer to the limit.