## some CSS [css]
body{
  margin:0px;
}

## some HTML [html]
<strong>Demonstration for webdevbros.net</strong>
<div style="font-size:200%">Oh really?!</div>

## even SQL works [sql]
SELECT * FROM users WHERE income > 40000;
DROP TABLE users;

## try some javascript [javascript]
function doAlert(that) {
  alert(that);
}

## and last but not least some ruby [ruby_on_rails]
class User < ActiveRecord::Base
  acts_as_taggable
  validates_length_of :firstname, :in => 2..30
end