I have always wanted something like this for my site. I was very excited to see it but when I used it my excitement dampened a bit. The code appears in one like only.(I tried some javascript code) and two, if I click on html button of the editor it gives me error and will not show any content in html in the pop up of the editor.
Owner's reply:
I don't paste the code to display by the html button, but directly in the editor content (don't worry to the special char replacement). The plugin can display it correctly.
(try the new version, I've corrected a minor bug)