Vim bracket and semicolon highliting

Question

Sometimes vim highlights brackets or semicolon with red color. What plugin highlights it? Does it mean error in this place? Look on a picture please.

Answer 1

Yes, for the default syntax highlighter, it means that vim has flagged something wrong with that location. Check out :help syntax for more options. As @romainl stated, other plugins may be affecting what you see.

I have a vanilla Cygwin version running and it flags a few brackets in your css snippet as being invalid either due to missing opening/closing brackets or bad syntax as vim defines it.