Today when I was adding an article, I was getting really upset with WordPress, I just wanted to add some simple characters and have it printed AS IS.
When working with WordPress and using special characters like a redirection symbol ” > ” or something enclosed in it’s on tag like “<dev>” it will get hosed while editing in “HTML” mode. You could insert syntax to stop it from doing that, but it’s much easier to add a post with such things in “Visual” mode first. Then switch over to “HTML” mode if any other special tags are needed.