Hidden characters in CSS

Question

I have been hours with a code that did not work and I could not find the problem. I simplified the problem to find it. At the end I find a hidden character, a character I co

Answer 1

After trying a lot of things. I find two free editors that show the error:
- TextWrangler: If I go to view > text display > show invisibles it shows a red ​¿ that is easy to delete.
- Aptana Studio: shows a red cross in the border and a point in the place with the white space.

I still don't know how or why this white spaces appear. For me was an important problem because it can collapse a project and there is no way to see it in my current editor Dreamweaver, no matter wich version I try. This white space cannot be detected either in collaborative tools like JsFiddle, Jsbin, CodePen or Dabblet.

As I said TextWrangler and Aptana are a easy to use and free way to solve it. If anyone can tell another editor or easy way to see it for non experts like me, it would be good to know.