"Using float for layout isn't a great idea, but sometimes you have to. CSS Lint simply checks to see if you've used float more than 10 times, and if so, displays a warning. Using this many floats usually means you need some sort of abstraction to achieve the layout."
Still a pretty nonsensical thing to write, isn’t it?
CSSLint does not even try to say anything about cutesy things like that. It is intended for different use cases and it is to be expected that a CSS Nyan Cat would fail CSSLint. There is nothing wrong with that, even if you believe that CSSLint is great.
http://en.wikipedia.org/wiki/Nyan_Cat
http://knowyourmeme.com/memes/nyan-cat-pop-tart-cat
This site has to have crazy music that auto-plays. If it doesn't it would not be Nyan Cat.