anchor.diff:  java -cp "cljs.jar;src" -m cljs.main -s
   ----
   
  -This command does not start REPL, so a browser window will not be automatically
  +`-s` is for `--serve`. This command does not start REPL, so a browser window will not be automatically
   opened. Navigate to http://localhost:9000 using your favorite browser. Check the
   JavaScript Console, you should see `Hello world!` printed. The build in web
   server gzips JavaScript. Check your browser network tab and you should be able
  
positive.code: (println "Hello world!")
  ----
  
  Let's create a release build:
  
  [source,clojure]
  ----
  
negative.code: java -cp "cljs.jar;src" -m cljs.main -c hello-world.core -r
  ----
  
  `-m`, which is short for `--main` invokes a Clojure function, in this case
  `cljs.main`. The `cljs.main` function supports a variety of command line
  arguments to specify common tasks. We're using `-c` for `--compile` to specify
  that we want to compile the `hello-world.core` name space. This is followed by
  `-r` for `--repl` to say that want a REPL to start immediately when compilation
  completes.
  
  Your default web browser will open to a page that looks like the following:
  
  After a couple of seconds you will see `Hello world!` print at the terminal and
  