In the future, please use the code snippet widget—it's the first item on the editor bar—when posting code or markup.
I don't see anything wrong with your markup, so I just tested and it works exactly as it should for me. Are you waiting 5 seconds for the first line to appear after clicking the "is supposed to be." link?
Suggestion: Making the player wait 5 seconds before anything happens after they take action is a little long. Some are likely to wonder if something is broken and the very impatient will likely already be headed for the escape hatch. Shaving a few seconds off of that is probably a good idea.