CODE_BLOCKS()

Basic code block
Hello, world!

Language-identified code blocks
<html>
  <head>
    <title>Hello, world!</title>
  </head>
  <body>
    Hello, world!
  </body>
</html>

Interspersed code blocks and text
Some text.

    Some code.

Here's some <pre> text.

        This is pre text.

Some more text.

    Some more code.