Why is “​” being injected into my HTML?

Question

EDIT: You can see the issue here (look in source).

EDIT2: Interesting, it is not an issue in source. Only with the console (Firebug as well).

I have

Answer 1

I have experienced this in a major project I was working on.

The trick is to just:

• copy the whole code into notepad.

• save it as a text file.

• close the file. open it again and copy your code back into your IDE
  environment.

and its voilà, it's gone.!