Just you. Once the editor actually loads (turning the “Haskell source” pane on the left from the page background’s deep violet into a dark gray and displaying a “hello world” program), I can type perfectly fine. And I’m using a browser based on WebKitGTK, which is not exactly known for its stellar compatibility.

Hm, works fine here (Firefox on Ubuntu).

But getLine doesn't seem to be implemented, so there is output but not yet input :)

I thought you were talking about typing in Haskell at first lol.