CoffeeScript in 1, 2, 3...

Ok, this is very easy, but nowhere to be found on the CoffeeScript site and shows how easy it's to get started.
I mean, really, why? If you're going to develop on Javascript, you don't want to "build" your code.
So, all you need is some simple HTML and the following:
<script src="coffee-script.js"></script>
<script type="text/coffeescript">
     alert "Hello CoffeeScript!"
</script>
Now add the "coffee-script.js" file in your path, and open it with your browser. No servers, no compilers, no NodeJS and nothing to install.