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some CSS (css)


			
body{
  margin:0px;
}

some HTML (html)


			
Demonstration for webdevbros.net
Oh really?!

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


			
class User < ActiveRecord::Base
  acts_as_taggable
  validates_length_of :firstname, :in => 2..30
end