Re: The Humanity
From the Rules page - edited so there is no invalid HTML:
"You can use basic HTML to format your text - once you have had five posts accepted for publication. Currently we allow: b, strong, em, i and s (strike was dropped in HTML5). Badge holders can also use sub, sup, ul, li, blockquote, q, code, and pre."
Code and pre tags use the formatting literally(?) That's for badge holders only though. Otherwise newlines are assumed to be paragraph tags