Sorry - I didn't realize there was a restriction on attachments! I just removed that.
I looked at your file, and I can see the weird space characters on both Mac and Windows. I think I know what the problem is. When you copy code from the site, if you double click (aka enter editing mode for the code) and then copy, this issue happens. If you just copy without double-clicking, this issue doesn't happen.
If that is indeed the reason why you are seeing these characters, that's a bug on the site. There isn't anything wrong in what you did. I'll fiddle with it shortly to fix it.
(Also, it's generally a good idea to have HTML files have an extension of .htm or .html. It avoids other unnecessary issues with encoding and such that may crop up )