I tried to write code with some highlighting. But failed.
Tried to include or write embed html code. Failed again.

pre.codebox
    code
        span.keyword class
            | Point:
        span.keyword def
            | __init__(
                em.common self
                    | , x, y)
            em.common self
                | .x = x
            em.common self
                | .y = y

Code above only write on 1 line.