I have noticed that if I refresh my browser, the messages don’t disappear. But the silver challenge says they will disappear. I don’t see the data in the session storage or the local storage. So how is the data being remembered?
@ballgeier, I think I misspoke when I wrote that challenge.
Here’s how to make the messages actually disappear on reload: make sure your Node.js server is not sending all of the existing messages to new chat clients. 
That should put you in the right situation to start building a caching mechanism.