CSS Lint points out problems with your CSS code. It does basic syntax checking as well as applying a set of rules to the code that look for problematic patterns or signs of inefficiency. The [rules] are all pluggable, so you can easily write your own or omit ones you don't want.
Let’s try it on a simple CSS class(with a small typo):
After clicking on the ‘LINT!’ button, we get a nice overview with all the errors found.