\u200b (Zero width space) characters in my JS code. Where did they come from?

Question

I am developing a front end of a web app using NetBeans IDE 7.0.1. Recently I had a very nasty bug, which I finally fixed.

Say I have code

var elemen         


        

Answer 1

As Mr Shawn Chin has addressed it already. I just happened to replicate the issue while I was copy pasting jquery code from a webpage.

When it happened: Copying text from Google Chrome Version 41.0.2272.118 m ( not tested with other browsers ) to Dreamweaver code window. This copied unwanted characters along the code like this happening here

you copied text from a webpage as

$('.btn-pageMenu').css('display'​​​​​​​​​​​​​​​​​​​​​​​​​​​,'block');​​​​​​

behind the scenes, this is what makes that line

​$('.btn-pageMenu').css('display'​​​​​​​​​​​​​​​​​​​​​​​​​​​,'block');​​​​​​

Copied to an advanced editor like those you mentioned or Dreamweaver gives errors in browser, probably failing of javascript code too

Uncaught SyntaxError: Unexpected token ILLEGAL

Solution: When it happens, embrace the worth of notepad until this gets fixed by the big guys. It is more related to the editor then the browsers.