I don't know how Jeremy could make it any clearer. It says:

CoffeeScript on the left, compiled JavaScript output on the right.

Maybe the two halves should have the headers directly aligned above them:

> CoffeeScript

> The JavaScript that it compiles to.

Other than that, it's hard to make it any clearer for its intended audience (people who know JS and know what the words "compiled" and "output" mean).

Still, I'm tempted to upvote the OP as good Friday satire.