Testing HTML code

<html>
  <body>
    <h1>This is insane body. </h1>
  </body>
</html>

Testing C++ code

#include <iostream>
cout << "print this" << endl;

Testing Ruby code

def print_hi(name)
  puts "Hi, #{name}"
end
print_hi('Tom')
#=> prints 'Hi, Tom' to STDOUT.